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Showing posts from January, 2017

Stereo left right sound test

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If you reverse left speaker and right speaker position, you will see picture move right but sound move to left, that seem annoying. Now it's time to correct a mistake!!!

simple bass booster circuit diagram

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This bass boost diagram is easy to build and work well, I made it because people asked me the schematic diagram of bass boost diagram on my youtube channel.

The circuit has 9 dB gain@40 Hz that mean you will get good bass performance even you play music to a small speaker. Why this circuit doesn't look like circuits on the internet?
Almost every circuit on the internet uses R/C filter between pre-amp and power amp stage to bypass high frequency to a ground and that seems audio signal being amplified and bypass to ground. I think it wastes pre-amplifier gain, the more gain preamp stage the more distortion to the audio signal, so I use a capacitor to send more negative feedback to pre-amp negative input when the frequency higher than cut-off frequency, capacitor impedance(resistance) higher when frequency lower and that make negative feedback decrease when frequency lower.
An op-amp distortion lowers when negative feedback higher, that mean high-frequency distortion lower when you use …

Infrared proximity sensor circuit diagram

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An infrared proximity sensor is a sensor that detects any object when it close to the sensor. The circuit is an important part of an automatic faucet, robot, and touchless switch.
An above image is an infrared proximity sensor circuit diagram. The circuit is simple and easy to make, it has 2 transistors, 4 resistors, an IR LED, an IR phototransistor, and a purple or white or green LED (use as an indicator so you can remove it if you want)
Electronic components list

This circuit's maximum detection range is 10 centimeters, you can decrease the detector range by changing R2 resistor. Use 7805 regulator IC if you want to use the circuit with 12 volts power supply. The infrared proximity sensor consumes around 50 milliamps per hour when standby and consumes around 80 milliamps(add a relay that consumes 30 milliamps) so you need an external power supply because battery life will not last long. The reason that makes this circuit consume much energy because IR LED need at least 50 milliamps …