This 1967 Philips circuit recognizes a light signal (visible or infrared) modulated by tone. The circuit makes use of components of the time that are equivalent to the current BCs.
This circuit can be installed inside a toy space gun to produce a “Phaser” effect. The circuit is from...
Found in an English publication from 1967, this circuit generates 5 kHz signals with harmonics that...
The characteristics of this amplifier that does not require a symmetrical source are given in the...