This circuit was suggested by National Semiconductor and is present elsewhere on this site. The LM2575 is not very common today and should be mounted on a heatsink.
We found this circuit in a November 1970 Radio Electronics. It uses a PUT or programmable...
We found this circuit in a technical documentation from the 1970s. It converts low frequency...
This modulated siren was found in the December 1974 issue of Radio Electronics magazine. A higher...