E)
This circuit uses a reversible double contact relay to obtain the trigger lock with the unijunction pulse. The relay must be of the sensitive type with at least 150 ohms of coil.
This circuit is from a 1995 Electronics Now. It generates a 1 kHz sinusoidal signal. See in the...
This circuit provides just over ½ W to a small speaker. We found this configuration in an old...
With a 120 ohms resistor this circuit can also be used as a shield for 3.3 V output voltages. The...