1-minute delay with Triac (CB21406E)

We found this circuit in a 1965 General Electric manual. The controlled load depends on the Triac and the 100 uF capacitor delay time.

| Clique na imagem para ampliar |

Gain controled shield for operational (CB8777E)
This circuit was found in a 90s Popular Electronics. With it, using a 4066, it is possible to...
Temperature compensator for VFO (CB8096E)
This circuit was found in a Popular Electronics from the 90s. The circuit has temperature...
AC Amplifier with LM3900 (CB14180E)
In the figure we have the basic application of an LM3900 transconductance amplifier, as suggested by...