Showing posts with label transistor. Show all posts
Showing posts with label transistor. Show all posts
Wednesday, November 19, 2014
Preamplifier Microphone with 2 Transistor
Microphone preamplifier or often known as mic preamp can be made use simplemicrophone preamplifier circuit as follows. 2 microphone preamplifier circuit uses 2transistors are PNP and NPN transitor amplifier.
Front of the microphone amplifier orpreamplifier microphone 2 transistor uses a system of dc negative feedback through R6which serves to provide stability strengthening. Level output signal from the microphonepreamplifier is controlled by potentiometer P1. Input signal that can be responded well by this microphone preamplifier is 0.2 - 200mV and 1V RMS output will result.
Microphone preamplifier circuit two transistors in the show above is preampmic suitable for home audio system on the stereo. This microphone preamplifier circuit requires supply voltages 9Vdc.
Front of the microphone amplifier orpreamplifier microphone 2 transistor uses a system of dc negative feedback through R6which serves to provide stability strengthening. Level output signal from the microphonepreamplifier is controlled by potentiometer P1. Input signal that can be responded well by this microphone preamplifier is 0.2 - 200mV and 1V RMS output will result.
Component List P1 2k2
R1, R2, R3 100K 1/4W
R4 8K2 1/4W
R5 68R 1/4W
R6 6K8 1/4W
R7, R8 1K 1/4W
R9 150R 1/4W
C1 1uF 63V
C2, C3, C4 100uF 25V
C5 22uF 25V
Q1 BC560C
Q2 BC550C
R1, R2, R3 100K 1/4W
R4 8K2 1/4W
R5 68R 1/4W
R6 6K8 1/4W
R7, R8 1K 1/4W
R9 150R 1/4W
C1 1uF 63V
C2, C3, C4 100uF 25V
C5 22uF 25V
Q1 BC560C
Q2 BC550C
Tuesday, October 28, 2014
TRANSISTOR TESTER 1
TRANSISTOR TESTER - 1
Transistor Tester - 1 project will test all types of transistors including Darlington and power. The circuit is set to test NPN types. To test PNP types, connect the 9v battery around the other way at points A and B.
10mH choke with 150 turns for the secondary
The transformer in the photo is a 10mH choke with 150 turns of 0.01mm wire wound over the 10mH winding. The two original pins (with the red and black leads) go to the primary winding and the fine wires are called the Sec.
Connect the transformer either way in the circuit and if it does not work, reverse either the primary or secondary (but not both).
Almost any transformer will work and any speaker will be suitable.
If you use the speaker transformer described in the Home Made Speaker Transformer article, use one-side of the primary.
TRANSISTOR TESTER-1
CIRCUIT
Thursday, September 4, 2014
12V to 220V 100W Transistor Inverter Wiring diagram
Simple 12V to 220V 100W Transistor Inverter Diagram
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