This circuit of the 70's uses transistors of the time. The circuit can amplify signals from 10 Hz to 100 kHz and modern equivalent components can be used. The circuit is from Ferranti.
Found in a 1960s Philips documentation, this circuit accepts inputs from 16 to 20 V. The...
The input of this regulator can be between 7 and 12 V and the output is 5 V. The circuit is from...
The circuit shown in the figure makes use of an LM3909, a low consumption and low voltage IC. The...