These circuits were obtained in an Electronics Now from the 90s. The integrated circuits are from that time and the power can be between 1.5 and 2 V.
This circuit is from American documentation from the 90s. The transistor is general-purpose and...
This transmitter was sent by contributing reader Adriano Muniz Moura from Pirapora – MG. It is in...
I found this circuit in a 1993 technical documentation. When we press the switch in parallel with...