This circuit was found in a 90's EDN. It can be implemented with either TTL or CMOS logic and used as a shield.
We found this circuit in an English publication of 1976. It can be easily assembled by changing the...
This circuit is from an1966 General Electric documentation. The Triac can be equivalent to 6 A or...
This circuit uses a PLL4046 oscillator to excite a piezoelectric ceramic. The circuit is from an...