Free Simple Circuit Diagram
Signal tracing is a method to find failure section of electronic circuit. This method is very common in troubleshooting audio electronics, since the tool for injection and monitoring will be very simple and cheap. The tracing method is done by injecting a signal source at one point and monitoring the response at other point, where the signal is assumed to […]
Read more
Below is the schematic diagram of an audio input module. We can produce a DC output voltage that is proportional to the input signal amplitude (the signal strength) using this circuit. One application of this circuit is audio level meter. Other application such as sound-controlled light circuit can be implemented with this circuit as well.
Read more
This circuit is a ultra low noise magnetic phono preamp. This circuit uses an LM381/1A. This circuit also includes RIAA equalization. This circuit has ultra low noise. The DC voltage level at the output of this circuit is about 16.5V, the voltage must be equal to half of the supply voltage. That can be done by adjusting potentiometer R7. Here […]
Read more
Unwanted noise is eliminated by FET. FET also added capacitance caused by long cobias connecting hydrophone to shore station. Voltage gain is unity. Hydrophone preamp can be used with cables up to 3000 feet long. Use 1 Meg resistor between gate and ground to suppress low frequency excursions of signals if hydrophone moves in water. [Circuit’s schematic diagram source: seekic.com]
Read more