Recently I got a L110 resistance decade box made by METRA Blansko, in former Czechoslovakia. Unfortunately something was rattling inside, so I had a quick look inside to remove the offending part - it was a small metal nut that … Continue reading
While on a buying frenzy at a local radioamatuer gettogether (Holice 2014) I saw an interesting looking PCB - apparently taken from some kind of older HP system, it had some very nice oscillators (500, 525, 100, 126 MHz), some … Continue reading
This gallery contains 77 photos.
While going through random electronics on a local flea-market (on the Inter Stadium in Bratislava, 98+% of the items there are of no interest, but the occasional treasure can be found, beware of pickpockets) I found this little device - … Continue reading
This gallery contains 116 photos.
The HP 6010A is a monster of a power supply, capable of providing 1kW. There are three limits: 17A, 200V and 1kW - that means that you can source 200V, but only up to 5A. You can suck 17A, but … Continue reading
This gallery contains 35 photos.
The HP 3476B multimeter is a neat piece of measurement equipment - probably one of the better choices for an economical (sold at 225 USD in 1976, around 1k USD today) 3½ digit digital meter in the later 1970s. It … Continue reading
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The analog part is the real heart of the device - here all of the precision magic and measurement happens. If you are interested in the detailed inner workings of the system, please read the service manual, which is available … Continue reading
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This is the second part of the teardown of the HP 3455A digital multimeter. It will deal with the logic part of the device. You can read the first part of the teardown HERE. And the last part, for the … Continue reading
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The HP3455A is a great device - Old, but great. It is a precision multimeter (voltage, resistance), made by HP in the 1980's. For part 2 (logic and control) CLICK HERE. For part 3 (analog and black magic) CLICK HERE. … Continue reading
WARNING: This article deals with high voltages, glass items and other fun things! The author is NOT responsible for any damage you do to yourself/others or whatever mischief you do. Do this at your own risk!!! I take no responsibility … Continue reading
I recently acquired an old EM80 magic eye tube. It seemed cool just to play around with it and maybe even make a nice sound level indicator - the thing it was made to do.The filament was OK, so I … Continue reading