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 circuit appears elsewhere in this section, obtained from other documentation. The circuit is for...
This is the typical circuit of a 60's tape recorder. The circuit uses only two transistors and has a...
Found in an Electronic Design from the 90s, this circuit uses a component of the time, difficult...