This circuit was found in a 73 magazine for radio amateurs of the 90s. The circuit uses two types of indicators, the diodes are for general use. The power supply is 5 V.
This amplifier uses common transistors in a phase inverter configuration. Transistors must be...
This circuit generates a linear ramp whose frequency depends on the capacitor and the setting. The...
We found this circuit in a Popular Electronics from the 90s. Transistors can be modern...