This circuit is from an 80's publication. It makes use of small 6 V x 50 mA incandescent lamps. The diodes can be general purpose or even 1N4002. The transformer is 6.3 V with 100 mA or more current.
This mixer uses only four passive component and can be used with high impedance sources. The input and...
This circuit was obtained in a 1974 Motorola timers publication. Transistors allow equivalents, the 2N2646...
Found in an old publication about neon lamps this circuit works directly connected to the power...