This circuit for equipment adjustment and diagnostics was found in a Mullard transistors manual from 1960. Information about the transformers is given with the diagram.
This configuration was found in an American publication from the 90s. Operators admit equivalents just...
The circuit shown in the figure has basically the same configuration as any TTL oscillator, with...
This circuit with the PLL567 serves as a decoder for PWM modulated signals of frequencies up to...