开云体育

The 5W out is at 28MHz, where the IRF510 efficiency is worse than awful...I'll try a LM317T supply on my BITX40 and report the results. The 317T can provide up to about 1.5A.

even LT1083CP can well be managed upto 7amps of load. being a low drop regulator one can manage a trafo with 24V secondary regards Sarma jgaffke@...> wrote:

5w out powered from an LM317 sounds fine. And yes, the current limiting would be very handy. 20w out of the bitx40 with the irf510 at 24v would not work quite so well.

An LM317 is a "bullet-proof" choice for powering an IRF-510, in my experience. I use this solution for beacon transmitters and they tolerate about anything (except lightning!). Since the LM317

Yes, around 150ma. 0.5v sounds high, perhaps more like 0.1v rms for the microphone input? Laptop supplies are usually spec'd conservatively and are well designed.?

?I think the main board is about 100-150 ma? Droppng 12V (from 24--> 12) would be about 1.2 - 2 watts, could be done with a small heatsink. I don't yet know about the noiselevel of laptop supplies.

However, something like an LM317 with heatsink might be about right for powering the main bitx40 board from the same 19-24v. that you feed the irf510 with. Then you could get by with a single old

Powering the BItx40 at 24v will require on the order of 50w, A load like that would turn those ebay LM317 regulators into smoking ash. That stuff gets spec'd as aggressively as they can sneak by with.

Have you considered trying laptop powr supply? I found a 19V one in a thrift shop for $5 and it seems to work so far; I added a 50 microfarad cap and a 0.01 at the output; here is one from walmart at

The LM317 version of the DC converter would be my choice. You'd need a 15-24 volt AC power transformer for it's input. The Lab supply would be a bit of overkill, but if you're building circuits, it

for powering the bitX40? final to 24v? Just add the appropriate power transformer, fuse, etc, seems reasonable.?

Paul N7PVA wrote... You can find it at the following URL. Be sure to add a function button! The instructions for the function button are included in the download. https://github.com/amunters/bitx40 --

Too big. Jack, W8TEE To: [email protected] Sent: Tuesday, October 17, 2017 10:33 PM Subject: Re: [BITX20] Temp Monitoring This is a pcb module we use at work for the DS18B2....BTW, I have this working

This is a pcb module we use at work for the DS18B2....BTW, I have this working in my BITx40v3 -- Paul Mateer, AA9GG Elan Engineering Corp. www.elanengr.com NAQCC 3123, SKCC 4628

hi all, where do I find the software to upload to the Raduino on my bitx40 so that the tuning is improved (won’t make the large jumps when tuning)? thx paul n7pva

and received it today (metro Atlanta)....ordered 10/13 and received on 10/17, that is fast. Now the fun begins. Dave k4em

After adding in new Lib. : #include <Encoder.h> // *https://github.com/PaulStoffregen/Encoder <https://github.com/PaulStoffregen/Encoder>* Upload OK and rotary appears to be way better: if you don't

Hello, This email message is a notification to let you know that a file has been uploaded to the Files area of the [email protected] group. *File:* B40SoftwareRel0108.ino *Uploaded By:* jjpurdum

Hello, This email message is a notification to let you know that a file has been uploaded to the Files area of the [email protected] group. *File:* B40SoftwareRel0108.ino *Uploaded By:* jjpurdum

Mike, 2905 NE 29th Ave Portland, OR? 97212 Thanks! Ralph