We found this circuit in a 1996 publication. Equivalent components can be tried, especially in the case of the photodiode. The circuit is powered by a 12 V source.
This VCO with the CMS 4046 was found in the August 1994 Electronics Now magazine. The frequency is...
Series and parallel regulator (CB8814E) The two voltage regulator configurations are combined in...
Found in Electronics Today International in the 90s, this circuit turns an operational on and off...