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.
The sensor is an NTC and in the connection as shown in figure (a) we have the trigger with the...
This oscillator configuration with the operational 741 was obtained in a European documentation from the...
Found in Motorola's 1965 manual, this full-wave dimmer controls a load that depends on the used...