Using red LEDs with ignition voltages of the order of 1.5 V we can make a multiple voltage reference. Current is low.
In this 1970s receiver, the coil has a primary with 100 turns and a secondary with 20 turns, both...
This conventional oscillator with the 741 can be precisely adjusted to produce a 400 Hz signal. The...
The figure shows how to increase the output current to about 50 mA of an operational amplifier. The...