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.
With a single LED on the scale, this voltmeter has low consumption. The circuit was found in the...
This circuit was obtained from the Linear Technology 2005 Application Manual. The circuit sensing...
A pulse applied to the input of this circuits results in a damped signal in the output. Frequency...