Archive for the 'tesla' Tag

Flyback driver #1: Single transistor driver

Back in 2008 before starting with high voltage, I have made numerous experiments with flyback transformers and with simple single-transistor drivers, most of these were undocumented. However, this was one of my very first high voltage circuits and my first -electronic- circuits in general, which were marked with some success. The resulting simplicity of this circuit pardons … [read more]

IT-65 Geiger counter (radiac meter)



Description: Czechoslovak army Geiger counter.
Manufacturer: Rudi Čajavec and TESLA
Made in year(s): late 60s-mid 80s; 1969 is mine model
Country of origin: Yugoslavia & Czechoslovakia
Status: Working, last calibration Feb 2006… [read more]

My vacuum tubes collection

A small selection, though being a non-collector myself, of some of my vacuum tubes (valves) that I have, or had at home, or which I had used in my circuits!… [read more]

Semiconductor free Geiger Counter

Tried searching the keyword “geiger counter” on Google, or even better, on YouTube? Now, how many of them contained a multitude of transistors, analog microchips or even digital microprocessors, and no shielding at all? Well, whatever the count is, a majority of them – if not all – are going to fail miserably, due to a huge electromagnetic pulse, when the… [read more]

Small Vacuum tube Tesla coil (VTTC)

To go along with flyback drivers, X-rays and other high voltage stuff, I have decided to build myself a Tesla coil. Because I live in a flat though, there would be no place to accomodate and run monstrous coil designs, not mentioning interference, so that is the reason why I’ve opted for small and sweet portable setups like this one is.… [read more]

TESLA ARF 300 headphones



Description: Stereo 2x 200Ω headphones.
Manufacturer: TESLA Valašské Meziříčí
Made in year(s): 1980s
Country of origin: Czechoslovakia
Status: Left driver speaker not working… [read more]

TESLA Merkur 4160AB B&W TV



Description: A portable black and white TV.
Manufacturer: TESLA Orava, k.p. Nižná
Made in year(s): 1982-1989
Country of origin: Czechoslovakia
Status: Not available… [read more]

TESLA Moderato 1037A radio record player



Description: Two speed record player with radio.
Manufacturer: TESLA Bratislava, k.p.
Made in year(s): 1983-1985
Country of origin: Czechoslovakia
Status: Working… [read more]