Found in Motorola's 1967 documentation this circuit can use any general-purpose transistor. The signal should be applied to a good amplifier. The noise diode can be replaced with a common one.
Using an operational amplifier with FET, this voltmeter has a high input resistance. The circuit has...
This circuit was found in a Linear Technology documentation from the 90's. The integrated circuits are...
This circuit generates signals controlled by crystal and can generate marks up to 30 MHz of 1 in 1...