Free Simple Circuit Diagram
Good/Bad transistor tester means that this instrument can only determine if the transistor is good or bad, nothing more. Any transistor with gain equal to 30 or more will be considered as good by this tester, and otherwise will be considered as bad. Here is the schematic diagram of the circuit: To use this instrument, we have to select S2 […]
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Phase shift oscillators uses capacitors to shift the phase of a signal coming from the output of an amplifier. If the phase shifting match the frequency, then a positive feedback will be produced a continuous sine waveform. Here is the basic schematic diagram of the circuit: To maintain the oscillation, the gain of the amplifier should produce exactly same amplitude […]
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This Wien bridge oscillator uses incandescent lamp to stabilize its amplitude. This amplitude stabilization gives a low distortion output. Multiple frequency range selector gives flexible and fine adjustment for the frequency. Here is the schematic diagram of the circuit: The 20k potentiometers is a dual channel pot, which is commonly used in stereo audio circuits. You can many types of […]
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Below is figure of a transistor square-law detector. At a low quiescent collector current (95 uA), it biased to operate so the output will be significantly nonlinear. To test the circuit, we can feed base with a 550 kHz RF signal about 30% modulated with 1 kHz which is produced by the RF signal generator. The signal has peak to […]
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