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Analogue AF Generator by SM0VPO
http://www.sm0vpo.altervista.org/audio/af-gen_01.htm
Note that the text "SM0VPO" must be the correct way round when you look at the copper side of the PCB. The above view is looking through the board from the component side, but with x-ray spectacles. Here is the PCB …
Speech Processor by SM0VPO
http://sm0vpo.altervista.org/audio/mic_processor.htm
Printed Circuit Board. The project is built on a single-sided PCB measuring 6cm x 6cm. All holes are 1mm Diameter, but 0.8mm works fine. Here is the PCB foil pattern, viewed from the copper side. If you can read the text on the copper side then it is the correct way round. Speech processor PCB foil pattern. The board is 60mm x 60mm.
Phasing Type SSB Exciter by SM0VPO
http://www.radanpro.com/Radan2400/RadioFrequency/Phasing%20Type%20SSB%20Exciter%20by%20SM0VPO.htm
by Harry Lythall - SM0VPO. ... This is a microphone amplifier which is followed by an audio phase - shift network, providing four audio signals. Each audio signal has a phase lag of 90 degrees from the previous output. ... Inject an AF tone of 1KHz into the Mic socket and look at the four outputs of the board. Connect the 0 and 90 outputs to ...
BH1RBG RF Lab - Audio: Discrete Power Amplifer
https://sites.google.com/site/linuxdigitallab/low-noise-crystal-experiment/audio-discrete-power-amplifer-for-receiver
This small audio amplifier is a revised version to SM0VPO's <<Beginners 250mW AF Amp>> . highly recommended this audio amplifier for your receiver. * 250mW to 8R (5.6Vpp) @7.2V supply , 500mW to 8R @9V supply * very stalbe DC bias cause of DC negative feedback * Supply from 6V to 15V, widely usable without change anything * Gain determined by R4/R9, eliminate the need …
Spiral loop - Nonstop Systems
https://nonstopsystems.com/radio/frank_radio_antenna_SM0VPO.htm
The original design by Harry Lythall (SM0VPO) (source: ref. 1) A "high voltage" type tuning capacitor is required, as very high voltages will be generated across the capacitor at resonance! The original design calls for a 25 pF variable capacitor. I used what I had in my junk box: a decent 5-15 pF trimmer capacitor.
AUDIO FILTERS & AUDIO PROCESSORS - Far Circuits
http://farcircuits.net/audio1.htm
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