This circuit amplifies signals from 0.5 Hz to 300 kHz. We found it in an old documentation. Equivalent transistors may be used. The gain is 20 dB.
This simple timer for incandescent lamps or other non-electronic charges uses a triac as a control...
This keypad telephone encoder circuit was found in ancient American documentation. The components used...
This interesting transistor configuration, which can be seen elsewhere on this website and in this...