Monthly Archives: January 2006

Second Amp schematics

Older post tube amp schematics looks something like this: Big circuit diagram for printing This schematics and tube amplifier is not designed for tube maniacs. It is designed to test tubes. Resistor’s and capacitor’s values may differ, because I build … Continue reading

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My second tube amp

I have lots of 12AX7 and 12AU7 pull-outs. And I need to test them. While building some testing gear, I decided to add one more tube and transform it to tube amplifier. Why it is “second tube amp”? Because, about … Continue reading

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Graphics LCD modules

Removed consoles from “big” copy machines. Two from Xerox 5343C and one from some other… There are nice graphics LCD modules with backlight and touchscreen: As this module is removed with some processor board, when powered it tries to do … Continue reading

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HiFi Stereo Tube Amp Schematics

In older post I wrote about unified soviet tube audio amplifier. This is from “high class” device. Today, I found the schematics of “highest class”, the HiFi audio device: AM/FM radio, record player. The output is 6W of pure tube … Continue reading

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Camera flash circuit

Here is the guts of disposable camera. Simplified schematics diagram of camera flash. Some high power flash tube from scientific equipment. Simple few transistors generator and transformer A transforms 1.5V battery voltage to few hundred of volts. This is quite … Continue reading

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HDD Grinder Stone

In some www I found image of HDD transformed to grinding stone. It was placed in “jokes” category. But I decided, that small grinding machine is useful for hobbyist. I use old 2G HDD “Western Digital Caviar 22500″. It is … Continue reading

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Typical Tube Amp used in Soviet HiFi :)

Soviet radio devices used typical schematics for same class. They called it “unified chassis” or “unified frame”. Here is part of the schematics from II class radio+phone player. Power output, according to manual, is only 1.5W, but it played very … Continue reading

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Ferrite Core Memory

For recycle, we received some “Medical computer” and inside I found this nice thing. The DIMM nearby is to compare the sizes. A small ring, or core, of ferrite (a ferromagnetic ceramic) can be magnetized in either of two opposite … Continue reading

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Barretter

Resistor inserted into a circuit to compensate for current changes (as those arising from temperature fluctuations) [syn: ballast resistor] B-300-G by NEC and unknown Soviet made. Tube filled with pure hydrogen and thing iron wire inside. When iron wire is … Continue reading

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Tube Amp power supply

From “something I found”: The nearer thing in the photo is power supply for some medical amplifier. The further one is the amplifier by itself. The interesting part for tube audio amplifier lovers is power supply. It is stabilised +150V … Continue reading

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