This indicator or VU meter for stereo amplifiers was found in a 90s Radio Electronics. The integrated circuit used is uncommon today.
This circuit is self-powered, that is, the sinusoidal signal that must be converted into a square is...
Originally this circuit excites an incandescent lamp, but it also serves for LEDs, if they use a...
In this circuit of 1987 the player has to briefly press one of the keys trying to hit which LED...