This 2mA source was found in a 1968’s Philips documentation. The transistor may be the BC549.
Found in American documentation from the 90s, this circuit is ideal for wearables and can be...
The circuit shown was found in a 1994 Linear Applications Handbook by National Semiconductor. The...
This vibrato circuit was found in Motorola's 1966 documentation. The circuit uses transistors of the...