Found in the July 1994 Electronics Now magazine, this circuit drives a relay up to 12 V depending on the power supply. The transistor can be general purpose.
We found this circuit in the 1994 National Semiconductor Linear Applications Handbook. The circuit is...
This LED diode test is suggested by the Texas Instruments optoelectronics manual. The transformer current...
The frequency of the sound produced in the speaker depends on the light that falls on the...