This is the receiver for the previous transmitter. The microphone is of the high impedance ultrasonic type. The circuit activates a relay. The operational amplifier supports equivalent.
The circuit shown in the figure on the right can be used on a data transfer bus with the use of an...
This timer was found in Japanese documentation from the 1960s. The transistor can be replaced by...
We found this circuit in a documentation from the 90's. The circuit can be assembled with 741...