Recent Posts

Posted in Admin's blog Ham Radio

Antenna rotor clean up

Some months ago I’ve received from the local A.R.I. radio club an old antenna rotor. I think it is a Daiwa but there is no…

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Posted in Admin's blog Ham Radio

Mosley TA-33-JRN

I’m an ham radio operator since year 2008. I’ve started this hobby with simple and relatively cheap equipment: an FT757GX transceiver and a long wire…

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Posted in Admin's blog High Voltage Schematics & Homebrew

High voltage generation from 3.3-5V

This post describes my standard DC-DC HV converter You know, to power up geiger tubes or photomultipliers there the need of high voltage at very…

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Posted in STM32

STM32 Mbed Quadrature encoder input

How to use a quadrature encoder with STM32/Mbed online compiler? This code is how I’ve solved it. At first, surfing the net searching for a…

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Posted in DDR/GDR tubes Geiger Muller Tubes

VEB Robotron 70013

I’ve found this tube from an eBay seller called “LCI electronics”. He’s from Bulgaria. This tube was made in ex DDR, German Democratic Republic, in…

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Posted in Admin's blog Ham Radio

PRC320 power supply repair

My military HF manpack radio PRC320, 3 months after I’ve bought it, started to make a whistle and was not able to tune on any…

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Posted in Schematics & Homebrew

TF530 Amiga accellerator

Surfing the web searching for an Amiga 500 accellerator board, I’ve found a series of youtube videos about the TF530 project. TF530 is a Open…

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Posted in Tests

Inside a russian Ge transistor

What’s inside a russian germanium transistor? I’ve a K.O. P217 metallic germanium transistor so let’s open it! The victim comes from an high voltage generator…

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Posted in Tests

Collins airborne meteo RADAR

INTRODUCTION Radar? WTF??? Yes, I’ve bought a radar on eBay for 1€!!! Seriously talking I’ve bought it plus it’s display for another 1€. 2€ for…

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Posted in Schematics & Homebrew

Amiga DB23 to SCART cable

I needed an Amiga DB23 to SCART cable. Searching online I’ve found this website Ian Stedman Thank you Ian for the nice work! I’ve tryed…

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