Circuit Project Electronic www.eleccircuit.com

Circuit Project Electronic www.eleccircuit.com

Dynamic Microphone Preamplifier using C945 transistor

Posted: 13 Feb 2013 02:11 AM PST

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. The frequency response is 50Hz to 100KHz. This circuit use the 12 volts – 24 volts DC power supply. An they is designed for use with 200 Ohm dynamic microphones. For usage with low impedance microphones. You can see the project Dynamic Microphone Preamplifier using C945 transistor 2 vertion and easy to build with pcb layout see below. Circuit of Pre MIC – 3 Transister (C945) mono PCB of Pre MIC – 3 Transister (C945) mono The second circuit. Pre MIC mono by 2 Transistor C945 This is low noise microphone preamplifier circuit, by 2 [...]

Car overheating alarm

Posted: 12 Feb 2013 07:37 PM PST

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 the temperature of the engine increases. The resistance of the thermistor decreases. Thermistor is connected to R1 for divide the voltage of the power supply to pin 2 of an op-amp IC1-LM741. This voltage will decrease as the temperature rises, by at VR1-100K is used to adjust a reference voltage at pin 3 of IC1. When a voltage at pin 2 lower than pin 3, IC1 will be switch close makes has voltage at output pin 6 to send to IC2. The IC2 is connected as an astable multivibrator to the sound signal generator circuit [...]

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