Circuit Project Electronic

Here is Circuit classic Wien Bridge oscillator using an Op-Amp covering a frequency range of 15 to 150kHz in four switched steps.
Two conditions exist for a sinusoidal oscillator. Regenerative or positive feedback, and a closed loop gain of unity. The losses in the wien feedback circuit, are such that the open loop gain of [...]

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Mr. chai is want circuit Function Generator with IC 8038 for see guideline repair circuit. I find in web http://www.mitedu.freeserve.co.uk/Circuits see to this circuit very work sure.
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Built around a single 8038 waveform generator IC, this circuit produces sine, square or triangle waves from 20Hz to 200kHz in [...]

Description:
A simple mixer with 3 line inputs and 3 mic inputs using commonly available parts.
Notes:
The mixer circuit below has 3 line inputs and 3 mic inputs. The mic inputs are suitable for low impedance 200-1000R dynamic microphones. An ECM or condenser mic can also be used, but must have bias applied via a series resistor. [...]