This circuit uses a transistor as a sensor and operates in the range of 0 to 50º C. We found it in old documentation. Operational equivalents can be used.
This circuit obtains phase-inverted signals from a single signal. The circuit uses two LM741...
This circuit with the HA2400 was found in the March 1980 Radio Electronics magazine. The circuit has...
This circuit with RIAA equalization is from 1985 US documentation. The circuit has a flat response...