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.
Found in 90s Radio Electronics, this audio indicator makes use of an integrated circuit that is...
This circuit uses only two components. The photocell can be obtained from calculators or other...
This Nixie pipe circuit was found in 1965 documentation. Note the high supply voltage. Appropriate...