This traditional configuration with the 555 was obtained in an 80s Hands-On Electronics. The relay is of the sensitive type according to the supply voltage.
Suggested by a 90s Electronic Design, this circuit drains only 0.25 mA from its source. Listening...
The crystal frequency of this circuit found in an American documentation is limited only by the...
This current sensor employs the Texas Instruments LMV358A low voltage operational amplifier. This...