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.
Found in a 1968 US publication, it is a font filter. The transistor is according to the desired...
This circuit was found in an American publication from the 70s, but it can be assembled with more...
Found in a 1995 Hands On-Electronics, this circuit generates a sinusoidal signal whose frequency...