The circuit shown is from the National Semiconductor Linear Applications Handbook of 1994. using ADC0808. The circuit can handle data from up to 4 transducers with an 8-bit output.
Wien Bridge This Vienna bridge oscillator generates a sinusoidal signal whose frequency depends...
This audio oscillator can also be frequency controlled by an LDR. The circuit is from a 1975...
In the 1992 publication, this amplifier is announced as having 400 W pmpo. Power transistors should...