Infrared detector (CB7814E)

This circuit was found in a Popular Electronics of the 90s. The operational amplifier admits equivalent and the phototransistor can be of any type.

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1000 second timer (CB12768E)
The existence of field effect transistors at the input of the integrated circuit (operational...
Voltage Regulator (CB16624E)
This circuit has a maximum output current of 5 A, and the 2N3055 must have an excellent heat sink....
15 V x 2A regulator (CB15969E)
This circuit is suggested by Motorola and is based on a 1723 voltage regulator. The 2N3055...