I second that comment about the "component tester" Clay! 100%
We should have a thread about inexpensive CDV-700 related test equipment.
There are even inexpensive oscilloscopes and scope-meters out there.
Geo
From: "freshndaire" <fanman@...> To: "CDV700CLUB" < [email protected]> Sent: Friday, May 13, 2022 9:56:57 PM Subject: Re: [CDV700CLUB] Leni conversion #3
This is where the cheap ¡°Multi-Function tester TC1¡± or similar shine.? They can help test and determine the type of component like resistors, capacitors, inductors, diodes/LEDs, transistors (MOS and JFETS, bipolar thyristors) and shows the E-B-C, G-S-D or A-K pins.? Can test low voltage zeners and some infrared transmitters.? Does ESR measurement on capacitors.? Measures batteries to 4.5V.? No need to worry if you have the right pin out, you can let the TC1 determine it.? Can¡¯t do highly accurate or high value measurements but it is great for a quick test of components. ?It is not super accurate on all the parameters it detects, but you can tell a Germanium from a silicon device via A-K or Vbe drops and know for sure what pin is what on identified devices.? ?My only real complaint was the battery always discharged over several days on mine so I added a real on-off switch that disconnects the little USB rechargeable battery.? I have not seen others complain about the problem so there may be something leaking more than the sleep current with mine.? I haven¡¯t had to charge it in months since I added the switch. ?It has been a real time saver.? Just be sure to discharge any caps before testing!? You should be able to find one in the $25 range.? Available anywhere cheap China electronics are sold.? I added a few precision components to my kit so I can test calibration if in doubt.? It is one of the most versatile tools I own.? You can watch Youtube videos to see if it looks like something you would find helpful.? I don¡¯t own an LCR meter and this adds that functionality to my lab with some limitations of course. Clay ? ? can you put back in the? original transistors? or maybe put some russian ones in the other unit, see if the work there? They for sure sent you germanium PNP's right?
From: "Michael C" <mtcooper01@...>
To: "CDV700CLUB" <[email protected]>
Sent: Friday, May 13, 2022 6:53:43 PM
Subject: Re: [CDV700CLUB] Leni conversion #3 Yes.? it is installed correctly.??
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OK MichaelC. Don't dismay. You have a good housing, a good meter etc.
Would you consider sending just the PCB to me and let me look at it??
Then you can move on to your next project but keep the housing meter etc. until I return the PCB or a different one for it.
By the way, I can remove the switch, set the tension, polish it up and it will look and work like new!
Also try to find ENi CDV-700's that have damaged or missing handles or probe clips for cheap. We'll talk off list about that.
Lenox, if you're reading this you do the same.
Geo
Geo
From: "Michael C" <mtcooper01@...> To: "CDV700CLUB" < [email protected]> Sent: Friday, May 13, 2022 9:35:36 PM Subject: Re: [CDV700CLUB] Leni conversion #3
yessir... this one is a puzzle.. maybe it is scrap.? ?
new transformer - got to buzzing, got at least some HV going - up to 500V
expected 15V is low at 5.7V measured between C1 (-) and meter.??
V2 base is high:? expected 0.05V, measured 0.7
V2 collector is low;? expected 15V, measured very low (didn't write it down)
V3 Base and collector:? expected 0.05V,? measured high on both.? Replaced V3 with another Russian, same.?
Replaced CR4 to address low 15V - same still low.??
even though getting some HV to the tube socket, no activity from the known good tube.??
no clicking from speaker.?
meter goes to position on dial as soon as you turn it on and sits there - depends on which range setting.??
replaced all the components except switch, Module A.??
Before doing anything - powered on the ENI as received,? got screeching through speaker at different range settings,? could hear clicks in speaker with probe against check source, meter pegged to the far right of dial.? ??
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This is where the cheap ¡°Multi-Function tester TC1¡± or similar shine.? They can help test and determine the type of component like resistors, capacitors, inductors, diodes/LEDs, transistors (MOS and JFETS, bipolar thyristors) and shows the E-B-C, G-S-D or A-K pins.? Can test low voltage zeners and some infrared transmitters.? Does ESR measurement on capacitors.? Measures batteries to 4.5V.? No need to worry if you have the right pin out, you can let the TC1 determine it.? Can¡¯t do highly accurate or high value measurements but it is great for a quick test of components. ?It is not super accurate on all the parameters it detects, but you can tell a Germanium from a silicon device via A-K or Vbe drops and know for sure what pin is what on identified devices.? ?My only real complaint was the battery always discharged over several days on mine so I added a real on-off switch that disconnects the little USB rechargeable battery.? I have not seen others complain about the problem so there may be something leaking more than the sleep current with mine.? I haven¡¯t had to charge it in months since I added the switch. ?It has been a real time saver.? Just be sure to discharge any caps before testing!? You should be able to find one in the $25 range.? Available anywhere cheap China electronics are sold.? I added a few precision components to my kit so I can test calibration if in doubt.? It is one of the most versatile tools I own.? You can watch Youtube videos to see if it looks like something you would find helpful.? I don¡¯t own an LCR meter and this adds that functionality to my lab with some limitations of course. Clay ?
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From: [email protected] [mailto:[email protected]] On Behalf Of Geo Dowell
Sent: Friday, May 13, 2022 6:15 PM
To: CDV700CLUB
Subject: Re: [CDV700CLUB] Leni conversion #3? can you put back in the? original transistors? or maybe put some russian ones in the other unit, see if the work there? They for sure sent you germanium PNP's right?
From: "Michael C" <mtcooper01@...>
To: "CDV700CLUB" <[email protected]>
Sent: Friday, May 13, 2022 6:53:43 PM
Subject: Re: [CDV700CLUB] Leni conversion #3 Yes.? it is installed correctly.??
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yessir... this one is a puzzle.. maybe it is scrap.? ?
new transformer - got to buzzing, got at least some HV going - up to 500V
expected 15V is low at 5.7V measured between C1 (-) and meter.??
V2 base is high:? expected 0.05V, measured 0.7
V2 collector is low;? expected 15V, measured very low (didn't write it down)
V3 Base and collector:? expected 0.05V,? measured high on both.? Replaced V3 with another Russian, same.?
Replaced CR4 to address low 15V - same still low.??
even though getting some HV to the tube socket, no activity from the known good tube.??
no clicking from speaker.?
meter goes to position on dial as soon as you turn it on and sits there - depends on which range setting.??
replaced all the components except switch, Module A.??
Before doing anything - powered on the ENI as received,? got screeching through speaker at different range settings,? could hear clicks in speaker with probe against check source, meter pegged to the far right of dial.? ??
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OK good to know. No need then probably. Have you traced all the PCB paths with an Ohmmeter already? Sounds like you've done everything right so far.
Geo
From: "Michael C" <mtcooper01@...> To: "CDV700CLUB" < [email protected]> Sent: Friday, May 13, 2022 7:27:03 PM Subject: Re: [CDV700CLUB] Leni conversion #3
yes I can reinstall the old ones.. and I built my last to Lenis with these Russian transistors and they worked fine.??
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yes I can reinstall the old ones.. and I built my last two Lenis with these Russian transistors and they worked fine.
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can you put back in the? original transistors? or maybe put some russian ones in the other unit, see if the work there?
They for sure sent you germanium PNP's right?
Geo
From: "Michael C" <mtcooper01@...> To: "CDV700CLUB" < [email protected]> Sent: Friday, May 13, 2022 6:53:43 PM Subject: Re: [CDV700CLUB] Leni conversion #3
Yes.? it is installed correctly.??
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Yes.? it is installed correctly.??
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it sounds right but I don't have schematic right here. It's the one that is attached to to transformer primary winding.
Geo
From: "Michael C" <mtcooper01@...> To: "CDV700CLUB" < [email protected]> Sent: Friday, May 13, 2022 3:29:45 PM Subject: Re: [CDV700CLUB] Leni conversion #3
hi Geo..? ?the -15V diode.. is that CR4?? ??
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holding the russian transistor legs up.. the base is the lead grounded to the case.? with the base at the bottom,? the collector is to the left, the emitter to the right.? Flipped over to stick in the board,? the collector is to the right, emitter to the left.??
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" I cannot produce clicks in the speaker by tapping R12-C5 junction.??
Voltages at V2 and V3 are all screwed up.? ?At V2, supposed to get .05V at the base - I get way high.? ?V2 collector supposed to get 15v, I get way low.? ? V3...? supposed to get .05v at base and collector - I get high on both.? These were supposedly new russian transistors.? "
There's been talk about those having different pinout than US ones, but I have not found that to be the case. The Russian, transistors, when held in you hand with the pins facing you and the "triangle" formed by the wires at?the pint on top, that point is the BASE. On the right side is the COLLECTOR, and on the left side is the EMITTER, same as USA transistors but the EMITTER? in US has a metal tab sticking out to mark the E.
Other members check me out on this, I'm not where they are to test right now.
George??
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hi Geo..? ?the -15V diode.. is that CR4?? ??
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Good on the 1G Meter MichaelC!
Tell you what, try removing the -15V diode, see what the HV does.
Geo
From: "Michael C" <mtcooper01@...> To: "CDV700CLUB" < [email protected]> Sent: Friday, May 13, 2022 2:20:42 PM Subject: Re: [CDV700CLUB] Leni conversion #3
yes, I am using a 1Gohm HV Probe.? and reading the manual it says if the 15V measured at point 6A ( negative end of C1 to meter) is low, replace rectifier CR4.??
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yes, I am using a 1Gohm HV Probe.? and reading the manual it says if the 15V measured at point 6A ( negative end of C1 to meter) is low, replace rectifier CR4.
so replaced CR4.? I still measure only 5.6V.? Supposed to be 15V.??
and more data: following troubleshooting in the ENI manual...
I cannot produce clicks in the speaker by tapping R12-C5 junction.??
Voltages at V2 and V3 are all screwed up.? ?At V2, supposed to get .05V at the base - I get way high.? ?V2 collector supposed to get 15v, I get way low.? ? V3...? supposed to get .05v at base and collector - I get high on both.? These were supposedly new russian transistors.??
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Well, maybe not. If you are using a 1,000,000,000 Ohm ( 1G Ohm or 1000 M Ohm) input meter, yes. Otherwise if you use a typical 10M Ohm type meter, you won't get but maybe half the real reading.
Read why here:
https://www.ebay.com/itm/294886705542
Geo
----- Original Message ----- From: Michael C <mtcooper01@...> To: [email protected]Sent: Fri, 13 May 2022 15:01:23 -0400 (EDT) Subject: Re: [CDV700CLUB] Leni conversion #3
ok I got some measurements.??
I am getting 3V to pin 6 of the transformer, per the schematic.?
I am supposed to get 15V at R5 - only getting 5.6V.??
I measure about 400V after the HV Diode and at the probe wire point on the board.??
so voltage falling off somewhere.??
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ok I got some measurements.??
I am getting 3V to pin 6 of the transformer, per the schematic.?
I am supposed to get 15V at R5 - only getting 5.6V.? ? and I have a question:? in the ENI manual on the schematic page, it gives a circle with a line through it - top numbers is volt and bottom number is range.? At R5 it has 15/25.? What is range 25?? ?
I measure about 400V after the HV Diode and at the probe wire point on the board.??
so voltage falling off somewhere.
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There's a kit for that, but you're handy with tools, so best learn to do it yourself, especially of you might be doing many more for yourself or others.
Geo
From: "Michael C" <mtcooper01@...> To: "CDV700CLUB" < [email protected]> Sent: Friday, May 13, 2022 12:42:20 PM Subject: Re: [CDV700CLUB] Leni conversion #3
ok George, will give it a whirl.? I need to wire the battery tray so I can have it off to the side and out of the way.??
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ok George, will give it a whirl.? I need to wire the battery tray so I can have it off to the side and out of the way.??
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" I now have a happily buzzing transformer.? I still don't have HV to the probe - using a HV probe, I get nothing on the hot wire going to the probe."
Start at the transformer leg, measure AC Volts there, then trace ot to the diode rectifier, where you should see +900V (is the HV rectifier in right way around?), if it's there, trace the PCB all the way to the white connector wire. Did you install the Zener stack? Is it the right way around?
A picture would help too, when you get that far.
Geo
From: "Michael C" <mtcooper01@...> To: "CDV700CLUB" < [email protected]> Sent: Friday, May 13, 2022 11:44:27 AM Subject: Re: [CDV700CLUB] Leni conversion #3
Ok,? Help ! :)? ? ?I installed a generic transformer I had gotten from Lenox 2 years ago on my first LENi project - it fixed my other Leni.? ?I now have a happily buzzing transformer.? I still don't have HV to the probe - using a HV probe, I get nothing on the hot wire going to the probe.? and the meter still moves to position on the dial depending on the range setting.? and you can move the needle position with the calibration knob.? Still no clicking sound out of the speaker.? ?and what is concerning is all the components except Module A, the switch, and the meter itself are new.? I would think it should work.? ?and with the bloody ENI battery tray installed (who designed this anyway - the summer intern headed out for spring break?) I cannot access any points to probe for voltages.??
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Hi MichaelC.
Have you reached the point in the LENi conversion where you take a hacksaw to the battery holder box? When you cut is in half, leave a little shelf at the meter end of the now 2 Cell holder to mount future accessories like a Speak2Me module. Naturally you direct wire it in, leaving wires long enough to remove the box and the LENi still has power.
see:
https://www.qsl.net/k0ff/Leni_Article_eBay_Ver/Geiger%20Counters%20in%20the%20Ham%20Shack-2019.docx
From: "Michael C" <mtcooper01@...> To: "CDV700CLUB" < [email protected]> Sent: Friday, May 13, 2022 11:44:27 AM Subject: Re: [CDV700CLUB] Leni conversion #3
Ok,? Help ! :)? ? ?I installed a generic transformer I had gotten from Lenox 2 years ago on my first LENi project - it fixed my other Leni.? ?I now have a happily buzzing transformer.? I still don't have HV to the probe - using a HV probe, I get nothing on the hot wire going to the probe.? and the meter still moves to position on the dial depending on the range setting.? and you can move the needle position with the calibration knob.? Still no clicking sound out of the speaker.? ?and what is concerning is all the components except Module A, the switch, and the meter itself are new.? I would think it should work.? ?and with the bloody ENI battery tray installed (who designed this anyway - the summer intern headed out for spring break?) I cannot access any points to probe for voltages.??
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Michael C