Re: Latest from MPJA ,... including Pack of 10- IRF510 N Channel FET Transistor 100V output transistors
The WA2EBY amp is the first successful broadband HF linear amp
using the IRF510's that I'm aware of.
Once that was working well with IR devices, there was some debate
why Vishay devices did not work so well.
Eventually, with a minor circuit change somebody figured out how to make both devices work fine.
Cheap switching NFET's are mostly meant for use at under a MHz.
For such use, it might be fine if some overseas vendor decides to re-label some
surplus NFET's that have a threshold of around 4v and can handle 10A of Id and 100V of Vd.
Running at 30mhz is a whole other matter.
Paul Harden, NA5N, wrote some good stuff 20 years ago on using the IRF510
for class C, D, E, and F amps (not for linear amps).
? ??
? ??
? ??
The final paragraph of that first link is especially entertaining.
IR no longer makes die for other manufacturers to package up,
If anybody knows of a good manufacturer other than Vishay, I'd like to hear about it.
A web search for "Samsung IRF510" doesn't come up with any vendors I'd be willing to buy from.
Perhaps NightFire makes a good IRF510.
They are being offered by a well known vendor here in the US.? ;-)
? ??
Jerry, KE7ER
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On Tue, Apr 13, 2021 at 10:27 AM, Arv Evans wrote:
Technology has improved a lot since the introduction of IRF510 devices in the early 1980s.? Raw material grading, dhigh resolution handling and laser trimming has
become standard.? IRF has apparently licensed manufacturing of IRF devices to
Samsung and Vishay, and probably several others.? This would seem to indicate
that other manufacturer's clones of the original IRF device may be improved
models.? It would take some highly technical testing to determine if a particular
IRF510 device is as good as the original IRF device, or if it exceeds the quality
of its original design.
?
Large marketing organizations like Digikey or Mouser do not have testing facilities
for determining as-manufactured quality of one source over another.? We have
to trust that they have chosen the best quality and least-cost manufacturers.
?
Some on-line sales outlets are focused on buying and selling of end-of-run
surplus components.? If these items are surplus for space industry or similar
high reliability projects they could be best-in-the-industry.? Or, if they are
surplus from the toy industry they could be worst-of-breed components.?
?
For the IRF510 devices it might be possible to build a decent test jig with
square-wave input, very high frequency scope monitoring, and calibration
to verify test results.? This is probably way beyond the capability of most
of us, and could be expensive to build.? Thoughts in this area are along the
line of using a calibrated and tuned detector at various harmonic frequency
points to see how much of the input harmonic energy is being output, and
at what level.? It gets complicated very quickly.
?
Arv
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Re: Latest from MPJA ,... including Pack of 10- IRF510 N Channel FET Transistor 100V output transistors
Technology has improved a lot since the introduction of IRF510 devices in the early 1980s.? Raw material grading, dhigh resolution handling and laser trimming has
become standard.? IRF has apparently licensed manufacturing of IRF devices to
Samsung and Vishay, and probably several others.? This would seem to indicate
that other manufacturer's clones of the original IRF device may be improved
models.? It would take some highly technical testing to determine if a particular
IRF510 device is as good as the original IRF device, or if it exceeds the quality
of its original design.
Large marketing organizations like Digikey or Mouser do not have testing facilities
for determining as-manufactured quality of one source over another.? We have
to trust that they have chosen the best quality and least-cost manufacturers.
Some on-line sales outlets are focused on buying and selling of end-of-run surplus components.? If these items are surplus for space industry or similar
high reliability projects they could be best-in-the-industry.? Or, if they are
surplus from the toy industry they could be worst-of-breed components.?
For the IRF510 devices it might be possible to build a decent test jig with
square-wave input, very high frequency scope monitoring, and calibration
to verify test results.? This is probably way beyond the capability of most
of us, and could be expensive to build.? Thoughts in this area are along the
line of using a calibrated and tuned detector at various harmonic frequency
points to see how much of the input harmonic energy is being output, and
at what level.? It gets complicated very quickly.
Arv _._
On Tue, Apr 13, 2021 at 10:49 AM Timothy Fidler < engstr@...> wrote: It is worth noting that Hans SUmmers of Qrp Labs will use the Vishay IRF510s and none other. He did a lot of tests before he came to that conclusion.
If you go to him for spare parts for a Qrp Labs kit - that is what he will sell you.? I don't believe he offers them as a? general on line sale part because of his restock costs.?
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Re: Latest from MPJA ,... including Pack of 10- IRF510 N Channel FET Transistor 100V output transistors
The IRFz24 might be made to work well at 7mhz,?but is not a drop in replacement on the uBitx.
Be prepared to give it significantly more drive, especially if you hope to run it at 30mhz.
Total gate charge of the IRF510 is 8.3nC
Total gate charge of the IRFz24 is 25nC
The IRF510 is hard to beat as a cheap NFET for an HF amp.
Jerry, KE7ER
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On Tue, Apr 13, 2021 at 09:46 AM, Timothy Fidler wrote:
IRFz24 is a nice RF subs for the IRF510.? It has been used to produce 45 W PEP in 7 Mhz ccts? in ARRL supervised tests
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Re: The "COCORICO UBITX" The French Touch
Gorgeous. Very clean soldering. And no flux leftovers.
I used to design my own circuit boards with ExpressPCB software and etch them
with toner transfer. Not as good as a board house, but I could have
an idea in the morning, and a board in my hands the same afternoon.
- Jerry KF6VB
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On 2021-04-13 09:18, Gerard wrote: Hello,
After several week-ends of soldering ding and fun to add the SMD
components, my Ubitx is almost finished. Only the PCB was made in
China.
I still have a few things to add (Quartz to test, 2nd Arduino, choice
of the final transformer and transistors of the PA, and one
regulator).
Project made with Kicad from a UBITX V6 schematic with additional
improvements (Micro amplifier, separate or no Nextion Alim, AGC, SWR,
2nd arduino, additional relay, options on 45MHZ filter, options on PA
Power, noise reducer, etc).
I didn¡¯t made any test a this point
And so it deserved a beautiful LOGO
cdt
Links:
------
[1] /g/BITX20/message/87598
[2] /mt/79553656/243852
[3] /g/BITX20/post
[4] /g/BITX20/editsub/243852
[5] /g/BITX20/leave/10189903/243852/952924773/xyzzy
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Re: Latest from MPJA ,... including Pack of 10- IRF510 N Channel FET Transistor 100V output transistors
Tim:
I've purchased from MPJA numerous times and never had an issue. As to the catalog photos, I just think they're lazy and not doing the photos, but are pulling them from a stock photo somewhere.
Jack, W8TEE
On Tuesday, April 13, 2021, 12:46:58 PM EDT, Timothy Fidler <engstr@...> wrote:
There? is a huge flag that the items shown are not even in a real photo. When you click on the RH image what comes up is a 3d impression with non real codes on it. So what the hell - do they even have them to photograph. I hate it when semi conductor vendors do this. If it is an Ebay seller? I don't want to know as likely he is selling product he does not have in stock? but he can get at the local bazaar .? That is forbidden in Ebay vendor policy, he can be struck off Ebay for doing that if you report it.
IRFz24 is a nice RF subs for the IRF510.? It has been used to produce 45 W PEP in 7 Mhz ccts? in ARRL supervised tests.? ?They are around 80c each from Tier one suppliers. Also they will come out of the same tube in general so are likely to be closer matched. Thermally they are about 30 percent better. Don' t go past the STP60N Mosfet either as used in the Texas topper RF amp. it has Cin intermediate between the IRF510 an the? z24 as mentioned above.? What world of possibilities to choose from !!!
TE. Fidler?
-- Jack, W8TEE
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Re: Latest from MPJA ,... including Pack of 10- IRF510 N Channel FET Transistor 100V output transistors
It is worth noting that Hans SUmmers of Qrp Labs will use the Vishay IRF510s and none other. He did a lot of tests before he came to that conclusion.
If you go to him for spare parts for a Qrp Labs kit - that is what he will sell you.? I don't believe he offers them as a? general on line sale part because of his restock costs.?
|
Re: Latest from MPJA ,... including Pack of 10- IRF510 N Channel FET Transistor 100V output transistors
There? is a huge flag that the items shown are not even in a real photo. When you click on the RH image what comes up is a 3d impression with non real codes on it. So what the hell - do they even have them to photograph. I hate it when semi conductor vendors do this. If it is an Ebay seller? I don't want to know as likely he is selling product he does not have in stock? but he can get at the local bazaar .? That is forbidden in Ebay vendor policy, he can be struck off Ebay for doing that if you report it.
IRFz24 is a nice RF subs for the IRF510.? It has been used to produce 45 W PEP in 7 Mhz ccts? in ARRL supervised tests.? ?They are around 80c each from Tier one suppliers. Also they will come out of the same tube in general so are likely to be closer matched. Thermally they are about 30 percent better. Don' t go past the STP60N Mosfet either as used in the Texas topper RF amp. it has Cin intermediate between the IRF510 an the? z24 as mentioned above.? What world of possibilities to choose from !!!
TE. Fidler?
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Re: The "COCORICO UBITX" The French Touch
Hello, After several week-ends of soldering ding and fun to add the SMD components, my Ubitx is almost finished. Only the PCB was made in China.I still have a few things to add (Quartz to test, 2nd Arduino, choice of the final transformer and transistors of the PA, and one regulator).Project made with Kicad from a UBITX V6 schematic? with additional improvements (Micro amplifier, separate or no Nextion Alim, AGC, SWR, 2nd arduino, additional relay, options on 45MHZ filter, options on PA Power, noise reducer, etc).I didn¡¯t made any test a this pointAnd so it deserved a beautiful LOGO
cdt
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Re: Waiting with Bated Breath
I have been doing the remote control thing for digital modes lately using a little Raspberry Pi-zero W which has built in WiFi. The intention was to act as a local hotspot when out in the boonies so I can use an inexpensive tablet to control it, but I have even left it connected at home and linked to it while waiting for a car repair many miles away and made contacts on FT8 and PSK31. The Pi-zero is a bit limited in processing capability, but cheap and the size of a stick of gum, so it was good for the lightweight portable application I intended. If size and weight (and cost) are not factors, better results could probably be had with one of the bigger brothers like the Pi-4.
=Vic=
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Reed, it would be nice from you to add such a functionality.
I know most Hams want to be free to decide by themselves to transmit or not because they are disciplined and they will never transmit on non authorized frequencies.
But some countries are more strict such as Japan and Thailand. Thailand will not authorize the import of a rig which can transmit outside of the Thai Hambands (?and they have a short lis of authorized transceivers (.
You can see the Icom IC-7300 in that list. With the IC-7300 you can enter "band edges" with a menu and you can choose one of the two following operating modes of the transceiver : 1. Beep when out of a hamband or 2. Beep and forbid transmission when out of a hamband". I think this could be a nice way to modify the source code as it would leave to the Ham the choice to have a signal like now when out of band, which most hams will prefer or prohibit the transmission, which some countries require.
I would appreciate a modification to your 1.5.1 because I am very much attracted by the iBitx, which reminds me of the first gear I built some 60 years ago, with vaccum tubes, Hi... but I shall order one only if I can have this out of band prohibition set.
73 - Pierre - FK8IH
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Re: Latest from MPJA ,... including Pack of 10- IRF510 N Channel FET Transistor 100V output transistors
John,
The Vishay's (and the IR parts before them) work fine in spite of the fact that they were not designed for use at RF.
Many amateurs have built linear amps with them, and I applaud that.
Cost on Mouser is $0.80 single piece, $0.30 if you buy a reel.
There are many IRF510 clones out there that simply don't work at RF due to high gate capacitance.
The assumption made is that they are being used for low frequency switching tasks.
Buy a couple hundred IRF510's of unknown manufacture for a budget price
and I've a hunch that a total of zero will screen for good RF performance.
Good luck.
Jerry, KE7ER
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On Mon, Apr 12, 2021 at 01:25 PM, Bob Lunsford wrote:
At $2.95 for ten, it's worth experimenting with them.
?
Bob ¡ª KK5R
For that price its worth buying a couple hundred, screen them for RF performance, offer the good ones to the group and sell the junk on e-bay lol. I wish I had the time, I would do it. Retirement can not come fast enough lol, couple more years. John On Mon, Apr 12, 2021 at 01:01 PM, John Cunliffe W7ZQ wrote:
On Mon, Apr 12, 2021 at 01:17 PM, Jerry Gaffke wrote:
The ebay/aliexpress IRF510's are questionable.
Some work fine as low speed FET switches as the IRF510 was originally designed for,
but operation in a 30mhz linear amp not so much.
And what would be wrong with buying parts that are working as original intended? Just because we hams are used to using parts outside of their spec doesn't mean that parts that work inside their original specifications are junk. If one wants well performing RF FETs one needs to buy them. The RD15VH1 is such a beast that is a mass produced FET that has been screened for reliable RF performance. I used to work for a company that made RF generators for the semiconductor industry. We used switching FET's for 13.5, 27.12 and 40.68 Mhz we bought from APT and Motorola. Those were of the shelf parts but screened at the manufacturer or at the incoming inspection for RF performance. The actual usable return out of a production batch was like 45%, the rest was not usable in RF applications and were used for switching power supplies.
So if I would use IRF510s to replace the ones I have, I would buy 50 of the cheap ones, make a small test fixture of a single transistor amp with the possibility to clamp the transistor in place instead solder and then screen them for performance. That would also give the opportunity to create matched pairs.
There are ample of projects the non performers can be used in from relay switches to power supplies. Most likely though, If mine ever die I will buy RD15VH1's and replace the 510s with real RF FETs. I.M.O. the better performance is worth the extra cost
John
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Re: Latest from MPJA ,... including Pack of 10- IRF510 N Channel FET Transistor 100V output transistors
Should have been RD15HVF1 lol? strange it doesn't let me edit my post.
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Re: Latest from MPJA ,... including Pack of 10- IRF510 N Channel FET Transistor 100V output transistors
On Mon, Apr 12, 2021 at 01:25 PM, Bob Lunsford wrote:
At $2.95 for ten, it's worth experimenting with them.
?
Bob ¡ª KK5R
For that price its worth buying a couple hundred, screen them for RF performance, offer the good ones to the group and sell the junk on e-bay lol. I wish I had the time, I would do it. Retirement can not come fast enough lol, couple more years. John
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Re: Latest from MPJA ,... including Pack of 10- IRF510 N Channel FET Transistor 100V output transistors
On Mon, Apr 12, 2021 at 01:17 PM, Jerry Gaffke wrote:
The ebay/aliexpress IRF510's are questionable.
Some work fine as low speed FET switches as the IRF510 was originally designed for,
but operation in a 30mhz linear amp not so much.
And what would be wrong with buying parts that are working as original intended? Just because we hams are used to using parts outside of their spec doesn't mean that parts that work inside their original specifications are junk. If one wants well performing RF FETs one needs to buy them. The RD15VH1 is such a beast that is a mass produced FET that has been screened for reliable RF performance. I used to work for a company that made RF generators for the semiconductor industry. We used switching FET's for 13.5, 27.12 and 40.68 Mhz we bought from APT and Motorola. Those were of the shelf parts but screened at the manufacturer or at the incoming inspection for RF performance. The actual usable return out of a production batch was like 45%, the rest was not usable in RF applications and were used for switching power supplies. So if I would use IRF510s to replace the ones I have, I would buy 50 of the cheap ones, make a small test fixture of a single transistor amp with the possibility to clamp the transistor in place instead solder and then screen them for performance. That would also give the opportunity to create matched pairs. There are ample of projects the non performers can be used in from relay switches to power supplies. Most likely though, If mine ever die I will buy RD15VH1's and replace the 510s with real RF FETs. I.M.O. the better performance is worth the extra cost John
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Re: Farhan to give sBITX talk at FDIM
Saw that fellow poster Jack W8TEE was on that list too. I don't normally sign up but will for this virtual event.
--
73
Dave
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Re: Latest from MPJA ,... including Pack of 10- IRF510 N Channel FET Transistor 100V output transistors
Best to ask MPJA.? If you need a particular manufacturer, it's better than that to order from a Tier 1 disti who WILL give you your manufacturer of choice.
IIRC, International Rectifier introduced the IRF-510 (ya know, IRF = International Rectifier FET....) and these could be surplus from them, which should make them good at RF.
Or they could be cheap Chinese knockoffs like the rest of the fleabay and Alibaba gaaah-baghe.
For $0.40 each, they may be worth taking a chance if you have a low-speed application in reserve,
73
Jim N6OTQ
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Re: Unresponsive ubitx V6
Symptoms match having a pressure point on the touchscreen.?
Make sure nothing is pressing on the glass.
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Talk: An Evening with Bob Heil K9EID Tuesday 13th April 8 pm BST (which is 1900 UTC)
You are all most welcome to join us on a talk:
Talk: An Evening with Bob Heil K9EID
Tuesday 13th April 2021 8 pm BST (which is 1900 UTC)
?
We are very excited to welcome the legendary Bob Heil K9EID to speak to us.
?
Bob Heil is a sound and radio engineer most well-known for creating the template for modern rock sound systems. He founded the company Heil Sound in 1966, which went on to create unique touring sound systems for bands such as The Grateful Dead, The Who, Humble Pie and invented the high powered Talk Box for Peter Frampton. Bob has been an innovator in the field of amateur radio, manufacturing micro- phones and satellite dishes for broadcasters and live sound engineers. He has won multiple awards and honors, and in 2007 he became the first manufacturer to be invited to exhibit at the Rock and Roll Hall of Fame.
?
Bob is well known in the theatre organ circles, beginning his career at the age of 15 playing the FOX theatre Wurlitzer in St Louis. In 2014, Bob Heil was awarded an honorary doctoral degree in Music and Technology from the University of Missouri.
?
Tuesday 13th April 2021 8 pm BST (which is 1900 UTC)
?
This event is hosted on Zoom (ID 7730730073): ?
(No password needed)
?
Also streaming live on YouTube:
?
?
(Bury Radio Society, with Warrington ARC)
Regards,
Trystan G0KAY
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I used my v6 about 2 times and now the screen is unresponsive to input. Can get into calibration page but again won¡¯t accept touch screen inputs. Can¡¯t tune with encoder either. Have tried reflashing firmware also. Would think was touchscreen is defective but why no frequency change when rotate the dial either? Any help? Anyone else experience this?
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Re: Latest from MPJA ,... including Pack of 10- IRF510 N Channel FET Transistor 100V output transistors
At $2.95 for ten, it's worth experimenting with them.
Bob ¡ª KK5R
On Monday, April 12, 2021, 1:17:14 PM EDT, Jerry Gaffke via groups.io <jgaffke@...> wrote:
Does anyone know if these are VIshay parts?
I would tend to buy IRF510's from Mouser or Digikey.
MPJA may be ok, but there is no indication of who the manufacturer is.
The ebay/aliexpress IRF510's are questionable.
Some work fine as low speed FET switches as the IRF510 was originally designed for,
but operation in a 30mhz linear amp not so much.
Jerry, KE7ER
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Gerard
Vic WA4THR
_Dave_ AD0B
Trystan G0KAY
Bob Lunsford