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 Hum Filter using electronic coil

Wednesday, November 19th, 2014

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 […]

 Analog To Digital Converter Circuit Using Simple Parts

Monday, November 17th, 2014

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 […]

 Low Noise Pre Microphone Amplifier

Saturday, November 15th, 2014

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 […]

 DIY Cheap Resistance Decade Circuit

Thursday, November 13th, 2014

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 […]

 Symmetrical Harmonic Oscillator circuit.

Monday, November 10th, 2014

This is the Symmetrical Harmonic Oscillator by the harmonic 3 that without tuning circuit because normal circuit use harmonic frequency always has the tuning frequency circuit. This is Astable multivibrator Oscillator circuit that has the crystal across between both emitter lead of transistors(BF494). The 40pF trimmer capacitor-C5 is connected with crystal to adjust the fundamental […]

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