This 5 V power supply for TTL, Shields and microcontrollers is old, and the components can be replaced by modern equivalents. Transistor Q1 can be a TIP31 and Q2 can be a BD135.
This circuit generates 50, 100 and 200 Hz signals from a 2.2768 MHz TV crystal. The circuit can be...
The figure shows how to use the LM3900 to drain current from a load of up to 20 mA with the...
Frequency modulated signals up to 500 kHz can be decoded with the PLL we show. The demodulated signal...