This 50% active cycle TTL clock generates signals from 4 to 20 Hz. Its power must be supplied with 5 V and other frequencies can be generated with capacitor replacement.
The integrated circuit is not common nowadays since the configuration was obtained in Motorola's Linear...
This amplifier was found in Burr-Brown documentation from the 90's. The gain can be programmed by resistor...
In the figure we have an IF amplifier step using a MOSFET. The circuit was found in a 1980s...