Products

UDVBM-1

UDVBM-1

I wanted to replace the drifty VFO in one of my rigs with a digital solution, but my hand-wired solution was messy, fiddly, and prone to ground loops and digital noise. So I designed a PCB ...
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PG-TIA Broadband IF Amplifier

PG-TIA Broadband IF Amplifier

The performance of a receiver or transmitter depends on careful impedance matching between its sub-systems: its mixers, filters, and amplifiers. Mismatches can cause loss of signal strength, inter-modulation ...
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TIA-AGC IF Amplifier

TIA-AGC IF Amplifier

Adding automatic gain control to a TIA IF amp makes the audio volume of a receiver as predictable as the impedance of the amp itself. AGC keeps strong signals from blasting-out your eardrums ...
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Dual-Gate MOSFETs

Dual-Gate MOSFETs

Dual-gate MOSFETs were once common in Ham radio designs, but no through-hole versions are now available on the market. These little half-inch breakout-boards with pre-soldered SMD versions might make ...
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OA741D Op-Amp

OA741D Op-Amp

The operational amplifier–the "op-amp"–was created to do by analog means what we now do digitally: to simulate mathematical operations. In application, though, op-amps have long been used for so-much more ...
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8-Pole QER Crystal Filters

8-Pole QER Crystal Filters

A clean, ripple-free and narrow-skirted "xtal" filter is essential for excellent performance, especially in a receiver. They are, however, among the most difficult builds for a home-brewing amateur to pull off ...
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I2C Rotary Encoder

I2C Rotary Encoder

Stop caring how many I/O pins your Arduino or other micro-controller has. Use the I2C two-wire bus and you can have an digital display, an Si5351, a number of other useful devices, and now a rotary ...
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GP Audio Amp

GP Audio Amp

COMING SOON! A general purpose, discrete-component audio amplifier with selectable three or four preamp stages. Based on a design by Richard Anderson, KE3IJ (SK) ...
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HyCas IF Amplifier with AGC

HyCas IF Amplifier with AGC

COMING SOON! A hybrid-cascode ("hycas") IF amplifier with AGC (IF-based). Based on a design by Wes Hayward W7ZOI and Jeff Damm WA7MLH ...
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