This is a very simple, low cost, Hi-Fi quality power amplifier. You can build it 5 ways, Please follow the table (from 20 W to 80 W RMS). Description: The first thing that you must do, is to measure the end transistors (T3 and T4) amplifying coefficient, the hfe or ?. If their disagreement is [...]
Continue reading → It’s a high Quality, simple design with 20 to 30V supply. Circuit Diagram: Parts: P1_________________10K Log.Potentiometer (Dual-gang for stereo) P2________________100K Log.Potentiometer (Dual-gang for stereo) (See Notes) R1,R2_____________100K 1/4W Resistors R3,R6______________15K 1/4W Resistors R4_________________10K 1/4W Resistor R5_________________22K 1/4W Resistor R7__________________1K 1/4W Resistor R8________________560R 1/4W Resistor C1,C2,C5____________2?2 63V Electrolytic Capacitors C3________________470?F 35V Electrolytic Capacitor C4__________________1?F 63V Polyester [...]
Continue reading → Circuit Diagram: Parts Lists: R1 = 1k R2 = 470k R3 = 10k R4 = 5k1 R5 = 4k7 R6,7 = 100k R8,9 = 1M R10 = 10R C1-10 = 100nF/63V C11 = 47nF/63V E1,4 = 220uF/16V E2 = 4u7F/16V E3 = 22uF/16V IC1 = ISD2560 + socket IC2 =LM78L05 IC3 = LM386 + socket [...]
Continue reading → A amplifier of acoustic frequencies can be manufactured with discernible materials, despite is known so much the difficulties of finding of materials, what the problem of regulations. These difficulties are overcome relatively easily if we find amplifier in form completed. Completed STK465 is an amplifier of acoustic frequencies that offers qualitative output, using minimal exterior [...]
Continue reading → It’s a very high Quality very simple unit and there is no need for a preamplifier. Circuit Diagram: Amplifier parts: 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 [...]
Continue reading → Circuit Diagram: Two low voltage, low power zeners are used to control electronically the level of an audio signal. The attenuation range is from 6 to 58dB for an input current from 0.042 to 77 mA corresponding to a control voltage from 2.7 to 7.5V. If control voltage is limited to 5V, the attenuation is [...]
Continue reading → Circuit Diagram: Circuit of a digital volume control using six discrete ICs, including a 5V regulator, is presented. IC1 (555) is configured to function as astable flip-flop. Its frequency or period may be adjusted by proper choice of resistors R44, R45 and capacitor C6 combination. Here it is for 0.3 second period. IC2 is a [...]
Continue reading → This project is a 3 or more lines mixer. For more than 3 inputs you can repeat the input parts (P=10K R=22K). It powered with 9Vdc Circuit diagram Components Layout PCB (5,5cm x 4,4cm)
Continue reading → The acoustic spectrum is extended by very low frequencies 20Iz and reaches as the 20000Iz in high frequencies. In the low frequencies is degraded the sense of direction. This reason us leads to the utilization speaker for the attribution of very low frequencies. The manufacture that to you we propose distinguishes these frequencies, in order [...]
Continue reading → Description The circuit is a microphone amplifier for use with low impedance (~200 ohm) microphones. It will work with stabilized voltages between 6-30VDC. If you don’t build the impedance adapter part with T1, you get a micamp for higher impedance microphones. In this case, you should directly connect the signal to C7. Circuit diagram Layout [...]
Continue reading → The 22 watt amp is easy to build, and very inexpensive. The circuit can be used as a booster in a car audio system, an amp for satellite speakers in a surround sound or home theater system, or as an amp for computer speakers. The circuit is quite compact and uses only about 60 watts. [...]
Continue reading → Cross-over they are netting usually with passive materials that have aim to separate a region of frequencies in smaller. Cross-over the manufacture that to you we offer it separates the acoustic region in two sub areas in order to we lead two loudspeakers for the high frequencies and for low. Cross-over they are essentially for [...]
Continue reading → This is a handy, easy to build general purpose 50 watt amp. The amp has an input for a radio, TV, stereo or other line level device. It also has a phono input for a record player, guitar, microphone or other un-amplified source. With the addition of a low pass filter at the input, it [...]
Continue reading → This amplifier is designed for self-powered 8, 4 & 2 Ohm loudspeakers with Bass-boost switch Circuit diagram: Parts: P1 = 10K Log.Potentiometer R1,R2 = 33K 1/4W Resistors R3 = 33R 1/4W Resistor R4 = 15K 1/4W Resistor R5,R6 = 1K 1/4W Resistors R7 = 680R 1/4W Resistor R8 = 120R 1/2W Resistor R9 = 100R [...]
Continue reading → Designing of 25W Mosfet audio amplifier with High Quality simple unit and No need for a preamplifie. Circuit diagram Parts: R1,R4 = 47K 1/4W Resistors R2 = 4K7 1/4W Resistors R3 = 1K5 1/4W Resistors R5 = 390R 1/4W Resistors R6 = 470R 1/4W Resistors R7 = 33K 1/4W Resistors R8 = 150K 1/4W Resistors [...]
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