This circuit was obtained in an old Elektor and can be adapted to use white power LEDs. The transistor must be equipped with a heat sink. The circuit has a battery charger.
Lamp Control (CB25902E) This low-current control circuit has a lamp as a load, but can have other...
This circuit operates from 25 to 65 kHz depending on the transducer used and the settings. We...
This TTL module can be used in counter and many of them can be cascaded to counts up to 99, 999,...