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.
The coil consists of 100 turns of wire 28 in a wooden or PVC tube from 2 cm to 2.5 cm in diameter with...
This circuit is based on the Texas Instruments LMC662 and has the function of monitoring the audio...
This circuit, which uses only common transistors, was obtained from a 1988 publication, but can be...