PIC LCF Meter

PIC LCF METER
This simple PIC-based unit was designed to measure and display the values of inductors and capacitors.
As a by-product of the technique used, it can also display the frequency of an external 0V / +5V signal source.
Capacitance: 1pF to 6500mF
Inductance : 1mH to 10H
Frequency : 0,05Hz to 5MHz

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32Watt Hi - Fi audio power amplifier TDA2050

32W HI-FI AUDIO POWER AMPLIFIER - TDA2050

The TDA 2050 is a monolithic integrated circuit in Pentawatt package, intended for use as an audio class AB audio amplifier. Thanks to its high power capability the TDA2050 is able to provide up to 35W true rms power into 4 ohm load @ THD = 10%, VS = ±18V, f = 1KHz and up to 32W into 8ohm load@ THD = 10%, VS = ±22V, f = 1KHz.
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120W MOSFET Power Amplifier with LM4702 Driver Chip

120W MOSFET Power Amplifier with LM4702 Driver Chip
National Semiconductor has been fast at work designing analog products for the high-end audiophile market. As for­tune would have it, these products such as the LM4780 Power Amplifier Chip and the LM4702 Driver Chip are easy to implement into high-quality designs for the audio DIYer.
National recently introduced the LM4702, a high-voltage driver chip that interfaces bipolar or MOSFET output devices. The LM4702 provides two small signal, input stages and voltage amplifica­tion stages (VAS). All you need to do is design a suitable bias system and output stage.
Not to be outdone in making the job easy for us amateurs, National provides a comprehensive design outline, guide to printed circuit board construction, ideas for the power supply, bill of materials, and suggested layout. In an application note dated May 20061, the company de­scribed an amplifier using high-qual­ity construction techniques and off-the-shelf passive components. The result is an amplifier with a vanishingly low level of distortion, 0.0006%. See More...

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Audio Power Meter With LM3915

Audio  Power Meter With LM3915
This VU (volume-unit) meter is capable of monitoring anddisplaying power levels present at the speaker terminals ofan stereo audio power amplifier.
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Build a Tube Preamp for guitar with tone control


I decided recently to build a tube preamp for my home studio. Please note, however, that this is not a circuit for the novice electronics builder. The circuit itself is simple, but unlike most semiconductor projects, this one uses voltages near 300V. The danger of electrocution is present and neither the author can assume responsibility for protecting you.
If you are not familiar with good construction and safety practices for high – voltage electronics, do not attempt to build this circuit.

So how does it sound?

This preamp won’t make the sound of an overdriven Marshall stack, nor is it a heavy metal distortion unit, but it does produce tonal colors ranging from a slight “warming” to soft distortion. Turning down the drive control produces a somewhat brighter sound with no distortion? Turning the drive all the way up produces distortion that really bites on the bass strings and softens out on the higher notes. Driving the unit hard also produces a bit of a compression effect. With my two – finger power chord playing style, I find the overall effect quite pleasing.

Build a Tube Preamp for guitar with tone control
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600 Watt Hi - Fi audio power amplifier PA600

600 WATT HI-FI Power Amplifier PA600

Attached is the schematic of a PA or subwoofer power amplifier capable of delivering about 650W RMS into 4­ loads. The original design was called ’PA 600’ and was first published in the German magazine ’Elrad’ in 1990.
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One Chip Fm Radio KA22429

ONE CHIP FM RADIO The KA22429 is a monolithic integrated circuit designed for Portable FM radio.
It is consistng of RF input stage, Mixer, IF, Mute control and Loop (earphone drive) AMP.
It is suitable a pocket - size radio.
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STEREO FM TRANSMITTER WITH I.C. BH1417


STEREO FM TRANSMITTER WITH I.C. BH1417

This is the latest BH1417 Stereo Encoder design from RHOM that includes a lot of great features in one small package. It comes with pre-emphasis, limiter so that the music can be transmitted at the same audio level, low pass filter that blocks any audio signals above 15KHz to prevent any RF interference and crystal based stereo encoder for stereo transmission.
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FM STEREO TRANSMITTER with BA1404


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10WATT TUBE HI-FI AMPLIFIER WITH PREAMPLIFIER (6N1P - 6N2P 807 OR EL34)


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100 W 8 ohms MOSFET amplifier with IRF9540 - IRF540

The Schematic Diagram is a basic MOSFET amplifier. Output power is 100 Wrms under 8 ohms or 160 Wrms under 4 ohms with distortion is 0.001 %. Bandwidth at -3 db is from 4 Hz to 100 Khz .
100 W 8 ohms MOSFET amplifier with IRF9540 - IRF540 1
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VU Meter with UAA180


VU Meter with UAA180 circuit

The circuit was designed based on the operation of Siemens UAA180 as it functions as a LED driver for light band displays for measuring the level of audio signals.
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90WATT VALVE POWER AMPLIFIER WITH EL34 + ECC83 + ECC82

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Stereo Digital Volume Control with DS1802

Stereo Digital Volume Control  with DS1802
The DS1802 is a dual audio taper-potentiometer having logarithmic resistive characteristics over the device range. Each potentiometer provides 65 wiper positions with a 1 dB increment per step and device mute. The DS1802 has two methods of device control, which include contact closure (pushbutton) inputs and a 3-wire serial interface for wiper positioning. The pushbutton control inputs provide a simple interface for device control without the need for a CPU.
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Audio equalizer with transistors BF245 - BC109

Audio equalizer with transistors BF245 - BC109

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LM-3875 Amplifier with ECC88 Tube Buffer

LM-3875 Amplifier with ECC88 Tube Buffer
TECHNICAL SPECIFICATIONS

Power Supply- toroidal transformer 230V/8*12V/180VA
- output amplifier rails 2*32V DC(2*24V), two bridges with two BYW95C diodes in parallel
- caps Samsung 470uF/100V, four per channel.
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DC _ DC Power suplies with I.C. SG3524 AND MOSFET BUZ11

inverter
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LM1894 Dynamic Noise Reduction System DNR

LM1894 Dynamic Noise Reduction System DNR



INTRODUCTION

The operating principles of a single-ended or non-complementary audio noise reduction system, DNR, have been covered extensively in a previous application note AN384, Audio Noise Reduction and Masking. Although the system was originally implemented with transconductance amplifiers (LM13600) and audio op-amps (LM387), dedicated I/Cs have since been developed to perform the DNR function.
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5Y3 + 7025 + 6V6 PUSH-PULL TUBE GUITAR OR HI-FI AMPLIFIER 6WATT

PUSH-PULL TUBE GUITAR OR HI-FI AMPLIFIER 6 WATT

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ECC83 + 5881 PUSH-PULL TUBE GUITAR AMPLIFIER 20WATT


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12AT7 - 6CL6 PUSH-PULL TUBE AMPLIFIER

PUSH-PULL TUBE AMPLIFIER

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AM Reflex Radio with tube 6EH8 - 2B46

AM Reflex Radio with tube 6EH8 - 2B46

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12 Volt Lamp Dimmer - REGULATOR

Here is a 12 volt / 2 amp lamp dimmer that can be used to dim a standard 25 watt automobile brake or backup bulb by controlling the duty cycle of a as table 555 timer oscillator. When the wiper of the potentiometer is at the uppermost position, the capacitor will charge quickly through both 1K resistors and the diode, producing a short positive interval and long negative interval which dims the lamp to near darkness. When the potentiometer wiper is at the lowermost position, the capacitor will charge through both 1K resistors and the 50K potentiometer and discharge through the lower 1K resistor, producing a long positive interval and short negative interval which brightens the lamp to near full intensity. The duty cycle of the 200 Hz square wave can be varied from approximately 5% to 95%. The two circuits below illustrate connecting the lamp to either the positive or negative side of the supply.

12 Volt Lamp Dimmer
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QUAD II POWER AMPLIFIER

QUAD II POWER AMPLIFIER
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10 - 20Watt Guitar Amplifier


Parts:

P1______________4K7 Linear Potentiometer
P2_____________10K Log. Potentiometer

R1,R2__________68K 1/4W Resistors
R3____________220K 1/4W Resistor
R4,R6,R11_______4K7 1/4W Resistors
R5_____________27K 1/4W Resistor
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Wireless IR headphone transmitter

Wireless IR headphone transmitter
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Wireless IR headphone receiver

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AUDIO MICROPHONE PREAMPLIFIER - Single IC

This circuit will is useful if you have a microphone or a device that produces a low audio level and you want to connect it to a stereo or something. This circuit will boost it's output level.


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100WATT CAR AMPLIFIER SCHEMATIC


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P400 hi-fi audio power amplifier




P400 caracteristic
Sinus power:382W (per chanal 8W load impedance)
Load impedance:2-16W
Frecfent caracteristic:5-100000Hz
Frecfent caracteristic:10-40000Hz (-1dB)
Damping factor:>150
Input impedance:60KW
Power supplay:±68V DC
Power consumption:10-450W
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Mosfet Amplifier - 240W / 400W




Parts List:
Component: Value: Qty:
Resistor 22K, 1W 01
Resistor 18K 02
Resistor 15K 02
Resistor 10K 02
Resistor 4.7K 02
Resistor 22 5W 02
Resistor 470 09
Resistor 220 01
Resistor 100 03
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12 Volt DC to 120/220 Volt AC Inverter

Low cost 12VDC to 120/220VAC Inverter
This inverter will sufficiently power any of your 115VAC (or 220VAC)small appliances। T1 choice of amperage is yours to make, but if you can salvage a heavy-duty unit from somewhere, use it. The least expensive method to get a larger transformer would be to remove the old 2000v primary and then re-wind an old microwave transformer.
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PA300 power amplifier (Elektor 11/1995)

Design by A. Riedl

Taken by themselves, the properties of the PA300 amplifier are not revolutionary. But taken in combination, they show something special: a robust 300 watt hi-fi power amplifier that is not too difficult to build.

PA300 power amplifier


There are several starting points to the design of a power amplifier: pure hi-fi without any compromise; simplicity and reliability; high output power. The design of the present amplifier is a mixture of these. The result is a unit that does not use esoteric components, is not too complex, and is fairly easily reproduced. In fact, it could well be named a 'Hi-fi public address amplifier'.
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MosFet Audio Amplifier 60W into 8 Ohm load

High Quality, powerful unit: 90W into 4 Ohm load

Circuit diagram:
MosFet Audio Amplifier
Parts:
R1______________47K 1/4W Resistor
R2_______________4K7 1/4W Resistor
R3______________22K 1/4W Resistor
R4_______________1K 1/4W Resistor
R5,R12,R13_____330R 1/4W Resistors
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Power Amplifier 45W with HEXFET IRF9540,IRF540



A ideal solution for the make a good, low cost power amplifier. Its a ideal solution for the creation a system of home cinema. The preamplifier and the driver support in a operational amplifier [IC1].
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170 Watt Class D Audio Power Amplifier with LM4651 and LM4652

170 Watt Class D Audio Power Amplifier with LM4651 and LM4652

























Description
The IC combination of the LM4651 driver and the LM4652 power MOSFET provides a high efficiency, Class D Amplifier solution.
This circuit is ideal for car booster amplifier, active speaker/subwofer, home theater, or PC’s multimedia sound system.

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2 x 25 W class-D power amplifier with TDA8922

2 x 25 W class-D power amplifier with TDA8922



















General descriptionShow


The TDA8922 is a high efficiency class-D audio power amplifier with very low dissipation. The typical output power is 2 X 25 W.
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ULTRALLINEAR AMPLIFIER ECF82 (6GH8A, 6KD8, 6U8A ) AND 6L6 (5881, 6P3C) 30WATT

ULTRALLINEAR AMPLIFIER
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30w + 30w GUITAR AMPLIFIER

GUITAR AMPLIFIER
GUITAR AMPLIFIER
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FET Audio Mixer

FET Audio Mixer
























Description

This simple circuit mixes two or more channels into one channel (eg. stereo into mono). The circuit can mix as many or as few channels as you like and consumes very little power.
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One tube (6AU6) radio



One tube (6AU6) radio


One tube (6AU6) radio
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3 Line Mixer Schematic

3 Line Mixer Schematic
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100W power amp. elektor april 1982

100W power amp
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1D8 Tube RADIO



1D8 Tube RADIO























1D8 Tube RADIO






















1D8 Tube RADIO
1D8 Tube RADIO
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