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 the amp and only later draw diagram.
V1- 12AX7 (can use 12AU7 or something, when input sygnal is […]
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 20 years ago I already almost build my first tube amp.
This is photo of tube […]
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 something…
“Good side"
“Bad side"
It is OPTREX DMF50073N-F-FW with 15 control and power lines.
The touchscreen in these two modules […]
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 power with lowest distortion. This device was manufactured in 1964 and schematics published in popular […]
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 high voltage. Then this high-voltage current passes through a diode, which rectifies current to DC. This DC current […]
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 only 5K rev/minute HDD. Removed cover and all heads, magnets. Took sandpaper and glued to […]
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 loud!
Big Circuit diagram for printing.
Pin 17, line 5: +200V
Pin 15, line 3: +260V
Pin 21, […]
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 directions (clockwise or counterclockwise). Therefore such a core can be used for storing a bit of […]
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 cold, the resistance is low. When temperature rises, the resistance is bigger. The difference of cold and […]
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 power supply. Also 6.3V for heater and something like 20V stablised on current. I've tested power supply […]
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