The circuit below was suggested by the Motorola Linear Databook of 1990. The component used is uncommon and the power can be between 7.5 and 12 V.
This circuit, which uses components still common today, was found in a 1997 documentation. It...
This circuit with its light source was found in American documentation two years 70. Or...
This circuit was found in a Philips documentation from 1966. The circuit provides 1 mW with a...