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.
This 1 kHz oscillator uses a Norton LM3900 operating system. The frequency depends on C1 and R1...
This configuration was found in a 1990s documentation. Modern operational amplifiers can be used...
This voltage regulator from STMicroelectronics provides a 1,2 A current in the voltage range from...