18W Amplifier Schematic Circuit

18W Amplifier Schematic Circuit Part List

P1_____________22K Log. Potentiometer (Dual-gang for stereo)

R1______________1K 1/4W Resistor
R2______________4K7 1/4W Resistor
R3____________100R 1/4W Resistor
R4______________4K7 1/4W Resistor
R5_____________82K 1/4W Resistor
R6_____________10R 1/2W Resistor
R7_______________R22 4W Resistor (wirewound)
R8______________1K 1/2W Trimmer Cermet (optional)

C1____________470nF 63V Polyester Capacitor
C2,C5_________100µF 3V Tantalum bead Capacitors
C3,C4_________470µF 25V Electrolytic Capacitors
C6____________100nF 63V Polyester Capacitor

D1___________1N4148 75V 150mA Diode

IC1________TLE2141C Low noise, high voltage, high slew-rate Op-amp
Q1____________BC182 50V 100mA NPN Transistor
Q2____________BC212 50V 100mA PNP Transistor
Q3___________TIP42A 60V 6A PNP Transistor
Q4___________TIP41A 60V 6A NPN Transistor

J1______________RCA audio input socket

Power supply parts:

R9______________2K2 1/4W Resistor

C7,C8________4700µF 25V Electrolytic Capacitors

D2_____________100V 4A Diode bridge
D3_____________5mm. Red LED

T1_____________220V Primary, 15 + 15V Secondary, 50VA Mains transformer

PL1____________Male Mains plug

SW1____________SPST Mains switch

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27MHz Transmitter Receiver Radio Control PCBs and Schematic Diagram

This article provides information about 27 MHz Transmitter-Receiver Radio Control related to its PCB assembly/construction. The picture below shows the schematic diagram of the transmitter using IC TX2B.

You will be explained with the instruction for constructing the PCBs (assembly, tuning, transistors, IC, resistors, capacitors (Disk Ceramic, Metallised Polyester, Electrolytic)) for both transmitter (Inductors, LED, Zener Diode, Crystal) and receiver (Zener Diode, Inductors, Resistors, Transistors) with the part value and specifications listed, and how to wiring up the PCBs for both transmitter and receiver.

Find complete description on 27MHz Transmitter-Receiver Radio Control PCBs and Schematic Diagram in this pdf datasheet application (source: scorpiotechnology.com.au).

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Two Transistors Wireless Microphone FM Transmitter Circuit Schematic Diagram

Two Transistors Wireless Microphone FM Transmitter Circuit Schematic DiagramPlease be warned if operating this circuit might violate the regulation of your country, because this FM transmitter circuit radiate strong radio frequency to the environment. This wireless microphone is very sensitive, pick up every sound in the 20m radius, and transmit the radio signal up to 2 kilometers in open air. Here is the schematic diagram of the circuit:

The first transistor (Q1) is the pre-amplifier for the microphone, and you can ommit this circuit if you don’t want to transmit the sound picked up by the mic, for example you can can connect your mp3 player directly to C1. The core of this FM transmitter circuit is Q2, a modified Collpits oscillator that the frequency is determined by L1, C4, C6, and the transistor’s internal base-emitter capacitance. The antenna use 1/16 wave length to compromize between the efficiency and the size. If you want the microphone to be less sensitive, you can replace the R1 by a higher resistor, try 10k or 22k, and this might overcome the feedback problem if you use this wireless microphone FM transmitter for a public address system.

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Cry Baby wah wah pedal Schematic Diagram transistor 2n3904

Cry Baby wah wah pedal Schematic Diagram used transistor 2n3904

Cry Baby wah wah pedal Schematic Diagram transistor 2n3904

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Graphic Equalizer Schematic 10 band Mono

This really is ten band graphic equalizer for 1 channel (mono) audio program. You will need build 2 similiar circuits for 2 channel (stereo) audio method. This equalizer construct depending on TL074 low sound JFET op-amp that will give you top quality audio output.

Graphic Equalizer Schematic 10 band Mono Part List:

....20= 10Kohms	C4= 10nF polyester	C18= 68pF polysterine
R21....40= 1Mohms	C5= 47nF polyester	C19= 360pF polysterine
R41= 10Kohms	C6= 4.7nF polyester	C20= 36pF polysterine
R42= 1Kohms	C7= 22nF polyester	C21= 4.7uF polyester
R43.....52= 2.2Kohms	C8= 2.2nF polyester	C22-23= 33pF polysterine
R53.....62= 47Kohms	C9= 12nF polyester	C24= 10uF 25V
R63-64-66-67= 47Kohms	C10= 1.2nF polyester	C25-26= 47uF 25V
R65= 10Kohms	C11= 5.6nF polyester	C27...32= 47nF polyester
R68-69= 47 ohms 1/2W	C12= 560pF polysterine	IC1...3= TL074
RV1....10= 100Kohms lin FADER	C13= 2.7nF polyester	S1= 2X4 SW for stereo
RV11= 10Kohms log.	C14= 270pF polysterine
C1= 180nF polyester	C15= 1.5nF polyester
C2= 18nF polyester	C16= 150pF polysterine
C3= 100nF polyester	C17= 680pF polysterine

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