This circuit was found in a 1968 Motorola documentation. The circuit can be implemented with virtually any photo transistor and general-purpose transistor.
For reference only, this is the first IF amplifier stage of a common transistor radio from the...
This oscillator employs a Motorola operational amplifier common in the 70s. We can implement the...
This circuit came out in a publication called Electronics Handbook of 1993. The circuit activates a...