This 6-transistor radio was sold in Japan in the 1960s. The super-heterodyne circuit for the OM band was powered by ordinary batteries.
We found this circuit in a Japanese documentation from the 1960s. The frequency depends on the...
According to its author, this device indicates the amount of force applied to the sensors. The...
The consumption of this circuit is only 50 uA in the standby condition and 4.5 mA when supplying a pulse...