This circuit can modulate a laser rate at frequencies of 50 kHz. We found the old documentation. The bipolar transistors can be the BD135 and 136 and the FET admits equivalent.
This circuit is from 1976 documentation, but it can be assembled with more modern transistors like...
This circuit was obtained from a datasheet from Linear Technology. The circuit converts the...
This circuit divides the frequency of a 2 kHz signal by 2. The circuit was found in Philips...