Check device data sheets. Per data sheet, RF3809 power down is via pin 1 "bias control". 0 = power down 8V to operate. (with Vcc=8V) Data sheet indicates filtering for the Vref pin. If Chinese board
Perhaps worth adding a second rectifier bank to allow using one, the other, or both transformers. One will be plenty for SSB and CW. Use both for AM and RTTY. As an aside, with predistortion would it
Nice job. Please correct me if I'm wrong. I'm an old fart but novice amp constructor. If amp is to be used strictly with a modern exciter that employs "pre-distortion", I can do away with a lot of fi
Thanks for the gs35b 6m amp link! Regarding "pre-distortion". Adjusting an amplifier's input signal to compensate for compression and other nonlinearities let's us run an amp to almost the point of s
https://cdn.shopify.com/s/files/1/0289/7782/3843/files/ALS-600S.pdf?v=1586534128 -do not look into LASER with remaining eye! _______________________________________________ Amps mailing list Amps@con
The schematic part numbers are difficult to read. Having the supply at hand should be enough. I found with one of their 13.8V supplies that once I had it apart. The only problem was discontinued high
Looks like the controller pn starts with TL. Likely TL594 or equivalent. Plenty of application info on line. For example: https://www.flywing-tech.com/blog/tl494-pwm-controller-working-principle-circ