Adjustable reference (CB21540E)

We found this circuit with 5.3V zener in a Philips publication from the 60s. The op amp could be a modern equivalent.

Non Inverting Amplifier (CB6437E)
This non-inverting AC amplifier was found on a Popular Electronics. The setting applies to any...
3 to 5 V inverter (CB9157E)
This circuit supplies 5 V from two AA batteries. The output current is 4 mA, resulting in an 11 mA...
5 V x 4A Power SUpply (CB12968E)
With this regulator we can have currents of up to 4 amps with 5V at the output. The transistor can be...