P1 on this Radio Shack circuit is a 6 V lamp with current up to 500 mA depending on Q2. The frequency is given by C1 which can have a modern standard value such as 3.3 uF or even 4.7 uF.
This simple circuit presents a voltage gain of about 1,500. The input impedance is high and the...
This modulator circuit can be used in AM transmitters up to about 10 W of power. The TDA2002 must...
This application, shown in the figure, is nothing more than a practical circuit to prove a 4093...