This circuit was obtained from a Philips documentation from 1968. The transistors can be replaced with equivalents, only with care so that the doubles are exchanged for matched pairs.
Line voltage compensation (CB8816E) This circuit for the alternating current line (AC line) was...
This electrochemical circuit monitors the conductivity of the oil indicating when to change it. The...
This bank of switches can be programmed in a variety of ways for logic experiments. The circuit is from...