This circuit was found in a Philips documentation from 1966. The circuit provides 1 mW with a power supply of only 1.3 V. Transistors support current BC series equivalents.
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...