This circuit is from Motorola documentation, but can be implemented with virtually any phototransistor and any general-purpose transistor. The supply voltage can also be changed.
This amplifier became famous in the 1970s, it was sold in kit by Ibrape, Philips subsidiary for...
This alarm circuit is from a 1987 publication, however the components used are still modern. The...
By connecting a common diode in series, it is possible to add temperature stability to the...