This circuit multiplies the input voltage by 3 and can work with up to 12 V input. The current is a few mA. We found it in the Radio Electronics magazine of December 1992.
This circuit is one of many that the reader can find in this section for testing crystals. The...
This circuit that uses only transistors indicates when the voltage in the circuit has the voltage...
This circuit was found in a 1981 publication and consists of an interesting handicraft game. The...