This regulator circuit is from Motorola documentation from 1969. It makes use of an integrated regulator of the time. With the indicated transistor, a current of up to 5 A can be obtained.
This circuit measures the conductivity of a saline solution, which is affected by the electrolysis effect....
With this circuit it is possible to compare the values of two capacitors in the range of 100pF to...
For triggering with the negative transition of the input signal, the circuit indicated for 0 4047...