This circuit was found in a 1968 Motorola documentation. The circuit can be implemented with virtually any photo transistor and general-purpose transistor.
This 9 V amplifier has a gain of 20 and provides a power of a few hundred milliwatts. The circuit is...
This circuit, suggested by Texas Instruments, uses a TIS43 or 2N2646 to produce short light pules. The...
Powered by just 1.5 V this 80's amplifier uses an integrated circuit of the era. The circuit is...