This shield circuit is from a 1968s Motorola documentation. The relay is according to the supply voltage. R1 can be reduced to lower trigger voltages.
We found this circuit in an old oscilloscope publication. With it, it is possible to observe the B...
This interesting circuit found in an old documentation uses neon lamp to indicate the percentage of...
This circuit was obtained in an American documentation translated in the 80's. The circuit can be...