The integrated circuit of this amplifier is not very common today. The output transistors can be TIP31 and TIP32 in heat radiators. The circuit is from the 1977 National Semiconductor Audio Handbook.
This SCR relaxation oscillator was found in an 80's Electronic Design. It flashes a small...
The coils for this transmitter, found in a 2002 documentation, have the following characteristics: L1 - 4...
This dimmer configuration is quite old, as it was found in a 1967 publication. The triac can be of...