This is the typical audio amplifier for a 1967 television. We found it in a magazine from the time. Note the use of the output transformer and the high supply voltage. The circuit is an RCA CTC21.
This circuit can generate time base signals from 5 to 1500 Hz. We find it in a documentation about old neon...
This analog thermometer was obtained from an English documentation. The sensor is a common diode...
The circuit transistors, found in a 1974 documentation, may be the BC548. The circuit is used in...