There are many ways to build the dual power supply from a transformer that has one secondary coil.This good way as Figure 1 use two bridge diodes. The first section is normally working, others section (D1-D4) will work by AC signal from C1 and C2. To filter DC voltage of out others bridge diode of […]
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There are many ways to filter the hum noise from AC line (50 Hz) from audio signal away. A frequency filter usage is a simple ways that include RLC as the electronic coil. In Figure 1 is the specific frequencies filter. Figure 1 the simple specific frequencies filter using RLC If thoroughly consider to see […]
Usually an analog to digital converter circuit or A/D that need to use the high accurate devices and and high difficult. But this circuit, The error of all devices does not affect the accuracy of the circuit. We just use the reference voltage only. How it works The CA3130 op-amp IC1 is assembled as the […]
Here is two low noise Pre microphone amplifiers. Which is simple circuit but high quality sound,includes devices that are selected very well. This circuit can be used to all normal microphone, for example: the dynamic microphone of Europe zone that has impedance of about 200 ohms, the Japan microphone has impedance of about 500-600 ohms […]
Here is DIY resistance decade tool for testing and calibration, because it can be substituted into a circuit with a all standard value. This ideal is cheapest that use resistors and wires only. In each experiment, a resistor must be involved at all times, and Often unable to find the required resistance. This problem will […]