Morse 555 Oscillator (CB26325E)

This circuit found on a William Sheets can be used with a headphone or external amplifier. The tone is adjusted with the potentiometer.

Instrumentation Amplifier (CB4939E)
This high input impedance circuit makes use of two operational ones that are still common. The...
Voltage Reference (CB15745E)
This circuit is suggested by Motorola and consists of a voltage reference based on an MC1403. The...
15 V x 1 A Power Supply Using the LM723 (CB862E)
The output voltage is adjusted by the trimpot. The power transistor mist be mounted on a heatsink. The 3.9...