We found this version of the automotive tachometer in a 1980s publication. Variations from other sources appear elsewhere in this section. The indicator is a 0 to 1 mA milliammeter.
In this circuit of 1987 the player has to briefly press one of the keys trying to hit which LED...
In this circuit, the current capacity doubles, but is still of the order of microamps. The...
In the figure we have an RS flip-flop made with two operational transconductance amplifiers. The circuit...