Voltmeter VTVM (T131E)

We find this circuit in documentation on tubes of the 1940s. The circuit applies to other triodes and the instrument is a milliammeter of 0 to 1 mA.

Reference Voltage Amplifier (CB4906E)
This circuit is from an old manual of operational amplifiers. The setting can be adapted to work...
Inverter Amplifier LM3900 (CB4502E)
Other series amplifiers such as the MC3301, MC3401 and LM2900 can be used on this circuit. We found...
IR Monostable (CB874E)
The duration of the output pulse in this circuit depends on C. This capacitor can have values in...