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 Dynamic Microphone Preamplifier using C945 transistor

Wednesday, February 13th, 2013

If friends are looking a somple audio amplifiers for a dynamic mic is high quality. So the low noise signal. I suggest this circuit because It use the three transistor (2SC945, or 2C1815 or 2SC828) is main Which typical transistor amplifier with a low noise this circuit, too. There are about 200-300 times the gain. […]

 Car overheating alarm

Tuesday, February 12th, 2013

This is a circuit sound alarm when an engine start spreading the heat. Although every car will have a temperature gauge. But in some cars. May be no warning if the engine is overloaded with heat. Or the driver may not have noticed the temperature gauge can cause problems. The circuit in figure 1 When […]

 12 volts switching power supply using transistor

Friday, February 8th, 2013

One of my friends asked. Can we build the switching dc power supply circuit with 2 transistor? The applications IC that Sometimes is difficult. A some number IC is hard to find. and very expensive. When considering Applications for some time. We do not need to use a high current. and have sufficient space to […]

 12 volt DC motor speed controller with pulse

Friday, February 8th, 2013

Usual, we just enter the voltage and DC current source to the DC motor, Makes motor can be rotated. If will modify or regulate the speed in rotation of the motor. Wewill need to enter the voltage look into pulses or periodically. Which will makes the average voltage at output is different. By the pulse […]

 Sun light control automatically using SCR

Thursday, February 7th, 2013

This circuit controls the turn the power off consumption in home automation. If it is daytime working to break the circuit. But at night is connected to a working electrical AC 220 volts. Such as the opening and closing of the bulb. This lamp will illuminate when the light bulb goes off into the evening […]

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