Wednesday, May 15, 2013

Repairing a Telecom AV-830 switching power supply (or maybe upgrading it)

I have an auxiliary Telecom AV-830 switching power supply I use from time to time. Recently while testing a circuit with it, the power supply explodes. The internal fuse was disintegrated and the main ICP was activated. That usually means something very bad is happening with the power supply.

Tuesday, May 14, 2013

A 10MHz TXCO master oscillator

The heart of any transverter system is the local oscillator. In practice, a transverter is as good as its local oscillator is. For my transverter project I choose a Toyocom TCO-291L2 oscillator I rescued from a UMTS board I have from surplus.

After spending a lot of evenings looking for its datasheet, I could not find it. I found the datasheet from other TCO-291 oscillators, but nothing from the TCO-291L2. Maybe it is a custom device, o maybe it is discontinued.