We found this circuit in a 1965 magazine. The circuit can be assembled with current equivalent transistors and the precision in generating the frequencies depends on the tolerance of the capacitors.
Combined with the two previous circuits, we can create a simple multimeter with this circuit. The...
This 1.5V instrumentation amplifier was found in National Semiconductor documentation from the...
This simple circuit helps to save incandescent lamps by leaving their filament slightly heated and thus...