We found this circuit in an old documentation. The integrated circuits used are specific to produce effects and do not admit equivalents, being currently difficult to find.
This configuration has already been found in other manuals, as the LM117 is manufactured by...
This is the radio receiver for the previous infrared alarm radio transmitter. It contains the...
This circuit, from an old publication from the 70s, can be assembled with a 2N2646 unijunction...