Transistor audio mixer (CB8759E)

Found in a 90s Popular Electronics, this mixer can be expanded to more channels. Transistors can be modern general-purpose equivalents.

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T Bridge Audio Oscillator (CB4689E)
This circuit is from an ancient American documentation. The T-Bridge circuit determines the...
MC3635 3-Axis Accelerometer (COM131E)
November 2016 - New mCube MC3635 3-axis accelerometers with I2C and SPI interfaces in 1 to 16 g...
Logarithmic amplifier (CB9006E)
This type of amplifier can be found in many other points in this section. This is from a 70s...