This high-impedance headphone circuit was found in a 1990s William Sheets. The power is low, but the high input impedance makes it useful for radio applications.
With a touch of the push button the lamp is switched on. A new touch and the lamp go out, in this...
This circuit produces fast light pulses in na incandescent lamp. Pulse rate is adjusted by P1. The...
We find this TTL configuration in a 1978s documentation. The circuit generates variable pulses...