This is a small transistor receiver for the medium wave range made in Japan in the 1960s. The circuit is powered by 9 V and has an output power of 25mW.
This circuit is used to detect PLL signals from the 4046 IC. The circuit is from an Electronics Now from...
This amplifier or stethoscope with headphone output and using a crystal microphone was found in a...
This circuit uses an 80's operational amplifier. The circuit is from an old RCA manual and can be...