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.
Using a 4046 PLL, which is not very common nowadays, this circuit was found in the October 1994...
This circuit includes an AD converter for interfacing with a microprocessor and can be used as a...
Found elsewhere in this section, this circuit mimics the noise of a steam locomotive. This was...