Small General Purpose PSU
Currently under heavy review This is the evolution of my General Purpose PSU for small-signal projects. The full-sized boards felt a bit of a waste of space for some projects where there is no need for 55mm capacitors or dual 5W resistors. The design is pretty standard. We can connect secondaries either in series or…
Simple jFet preamplifier – jBoZ – July 2024 progress
I have finalized my project with some minor inclusions. The biggest change is that I decided to follow the H2 v2 schematics published by Nelson Pass on diyaudio as an alternative setup. This uses the cheap and available J113 jfet instead of the 2SK170. And uses a potentiometer in series with the loading resistor to…
Small PSU – PCB finalized
This is a small floating rectifier and CRC/CLC filter. Its functionality is pretty standard. This is the evolution of my existing boards to include a few minor changes, and migrate the design into Kicad. The new PCB will come with the design panelized to reduce cost and allow wiring for dual rail. The V-Cut will…
Evaluating PCB – Technics SL1200 MK2 Regulator v.0.3.2024.b
I received the new boards a few weeks ago, but did not have the time to work on them. They contain a few new features in comparison to my 2017 boards. The bigger one is the monitoring leds and testing points at the bottom. And then the big 35mm electrolytic and 100nF bypass ceramic capacitors.…
New Project – Small PSU
A small board with a full floating PSU unit that includes a full wave rectifier with a Quasimodo snubber and a CRC or CLC filter The past few weeks I have been working on the PSU and regulator of my Technics SL1200 MK2 turntable, while migrating most of my old boards into KiCad. At first…
MoFo – Single Ended Mosfet Follower Amplifier
This simple amplifier was published by Mike Rothacher back in 2017 for the Burning Amp Festival The concept is rather simple. It’s a single mosfet, loaded by a choke, and surrounded only by the parts required to bias it. It is a power buffer with unity gain, it is AC coupled both on the input…
General Purpose PSU
This page will document the evolution of my general purpose power supply project. As designed, the PSU will include a full wave rectifier, a CRC/CLC filter, and a Quasimodo snubber. Changelog
Evaluating PCB – General PSU v.0.3.2024.a
I received the boards a few days ago from Elecrow. I have been using them for a few years and I am pretty happy with the quality and the prices. I usually make my boards fit a 100x100mm square, so that I take advantage of their special prototyping pricing. This board was an opportunity to…
Simple jfet Preamplifier – jBoZ
This project is my take on the very popular simple preamplifier posted by Nelson Pass back in 2007 on DiyAudio. Introduction We could consider this simple circuit a “modern” version of the older Bride of Zen preamplifier. It follows the same simplistic approach of using a single active device with minimal peripheral parts. Here is…