Category: Blog
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…
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 – Progress June 2024
I made a few changes to the schematic and PCB. The biggest one was to create a jfet footprint that supports both DGS and DSG packages. The idea came from the PCBs designed by Passworks for the 2022 DIY front-end, published at diyaudio. Basically, it allows a plain 3-pin symbol for the schematics, and defines…
Technics SL1200 MK2 Regulator progress – Alpha version finalized
Version 0.3.2024.a is finalized and I have ordered some sample PCBs from elecrow. I have also assembled a first draft of a BOM, with parts that I either have or that I can easily order. I have also added some notes on the schematic. These can be shown on the HTML BOM file so that…
Simple jFet Preamplifier – jBoZ – New Project
Catching up with my numerous projects, it’s time that I revisited my version of what became popular in diyaudio and pass labs circles as the jBoZ preamp. There is nothing particularly critical about the circuit. It’s pretty much a simple jfet circuit, very close to what one can find in electronics tutorials. Below you can…
Technics SL1200 Regulator progress – last RC stage
Rechecking my old notes I did some changing to the PCB of the regulator