This circuit generates short pulses. The transistor can be a 2N2222 or BC548 and the frequency is given by the resistors and the capacitor that can be changed.
This circuit allows linear brightness control of an LED from an input voltage. The power supply must...
With this system you can disconnect phone lines in case of need for protection. The circuit is...
The integrated circuit used in this 80's mixer is the LM301A. However the circuit can be used to...