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Thanks all! Since I am trying to continue supporting the Nano (very criptled because of flash size), I don't have an extra GPIO pins. So will use the transistor with a current limiting to do the

WRT switching negative/positive: Here's a link to the manual for that keyer. The schematic is on page 21. The PTT circuitry is just a pair of 2n7000 MOSFETs. The keyer is cased in a plastic box. I'm

Hello Mark, Inversion of the signal is simple - it can be done with a single NPN transistor and one resistor. Your output turns on the transistor, and the resistor limits the base current. It gets

Hi Mark, Here is an inverting switch that I use on my TeensyMaestro project to key my rig.? This assumes keying a positive line by bringing it to ground.? This can be just about any NPN switching

Hello Mark, Good initiative. I am interested to know the objective of porting into Teensy and Pico. Though bit contrast Teensy is expensive than Pico. I made a usdx during covid times, the audio TX is

Hi Mark… welcome aboard. No need to reinvent the wheel… there are plenty of commercial radios doing this already. I’d just plagiarize the circuit out of the K3… it works really well for me!

I am working on a series of new uBITX Raduino boards that support newer MCU's like Teensy, PICO, and the upper end of the Arduino nano family. As part of this I have ported the KD8CEC firmware to

Thanks Lou. I’ve had two people in the last month tell me that they had faulty connectors on the coax they used at the output of the amp (not the surface mount but the one on the coax)… and they

Bill, thanks for this, very helpful wrote:

The following files and folders have been uploaded to the Files area of the [email protected] group. * /K9HZ 20W 1-54 MHz RF Amplifier module/20W AMP 160M-6M Troubleshooting Guide V1.00

Ok… well I did send you another 3 foot length Friday a week ago by Airmail. It’s the right stuff for what you need. Dr. William J. Schmidt - K9HZ J68HZ 8P6HK ZF2HZ PJ4/K9HZ VP5/K9HZ PJ2/K9HZ

This is an expansion. I have ordered backup thru aliexpress. Just shipped. See in 2-3 weeks. Not a problem. $1.39 a yard rarher than $12 a foot-quite a difference I want to build V012 so waiting till

Yes, I use Kicad too… but the original files were and still are in DipTrace. Eagle has vacillated between FREE and EXPENSIVE the entire time it’s been available. I believe it’s been discontinued

A very very long time ago I used Eagle, too, until "they" decided that student/hobbyist licenses for a few 100 $ are no longer available. After continuing a while with the license I still had got, I

Yeah. Well, it’s a really good design program for small PCBs…. Eagle is better for large designs by far. Dr. William J. Schmidt - K9HZ J68HZ 8P6HK ZF2HZ PJ4/K9HZ VP5/K9HZ PJ2/K9HZ VP2EHZ Owner -

OK Bill, thanks for that. Just wondering really, but not about to spend that sort of money. (US$700 = ~AUD$950) Glenn vk3pe

Hi Glenn… Well… Its not necessarily my favorite, but Al started this by using “Diptrace”… so I bought a copy (the 1000 pin version). It’s cheap for the low pin count but gets progressively

Bill, what software are you using for the Sch and PCB's? vk3pe

Bruce… did you get the wire? Dr. William J. Schmidt - K9HZ J68HZ 8P6HK ZF2HZ PJ4/K9HZ VP5/K9HZ PJ2/K9HZ VP2EHZ Owner - Operator Big Signal Ranch – K9ZC Staunton, Illinois Owner – Operator Villa

The following files and folders have been uploaded to the Files area of the [email protected] group. * /K9HZ T41 V010 Board Sets/T41 V010 Schematics/T41 DC Power Supply V010.dch (