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2x30W (stereo) Amplifier with STK465 - 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….(design added 08/08) [Site is underconstruction right now] |
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3 Channel Spectrum Analyzer - This 3 channel 15 LED spectrum analyzer is the
perfect addition to any audio amp project. It produces fantastic displays on three LED
bars that can be individually adjusted for any particular frequency range. The circuit
will take line level output from most any audio source, and operates on 12V DC.
This means that it can even be run in a car. (design idea circuit added 09/08)
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3 Transistor Audio Amp 50 Milliwatt - Here is a little audio Amplifier
similar to what you might find in a small transistor radio. (added 4/02) |
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3: 5 Watt Class-A Audio Amplifier - Behaves like a one-valve operated
Amplifier Simple circuitry No cross-over distortion (added 3/05) |
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300 Watt MOSFET HI-FI Power Amplifier - The amplifier consists of two
completely separate monaural amplifiers each channel has its own power supply,
resulting in zero inter-channel cross talk, a common phenomenon in amplifiers
sharing the same power supply.….(Circuit design added 11/08) |
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30w + 30w Amplifier - (electronic circuit added 08/08/08) |
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30W Class AB Amplifier - To set the above amplifier up, set R1 to max
and R12 to 0. After doing this successfully, power on the amplifier. Set R1 so
that the measured output offset is between 30 and 100mV. Once set, adjust R12
slowly to achieve a quiescent current of around 120mA. Keep checking the
quiescent current as the amp heats up as it might change due to voltage drop
changes in the output devices caused by heat. The heatsinks should be 0.6K/W or
less for two amplifiers. ….(Circuit design added 11/08) |
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30W MosFet Audio Amplifier - This project was a sort of challenge: designing
an audio amplifier capable of delivering a decent output power with a minimum parts
count, without sacrificing quality. The Power Amplifier section employs only three
transistors and a handful of resistors and capacitors in a shunt feedback
configuration but can deliver more than 18W into 8 Ohm with <0.08% THD @ 1KHz at the
onset of clipping (0.04% @ 1W, 1KHz and 0.02% @ 1W, 10KHz) and up to 30W into a 4 Ohm
load. ….(electronic schematic added 11/08) |
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32 Watt Stereo Amplifier - A 32 Watt per channel stereo power amplifier made
using the TDA2050V monolithic integrated circuit. [Design by Andy Collison] |
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3-Band Equalizer - Using a single op-amp this easy to make equalizer offers
three ranges, low frequency, mid frequency, and high. With component values shown re
is approximately +/-20dB of boost or cut at frequencies of 50Hz, 1kHz and 10kHz.
Supply voltage may be anything from 6 to 30 Volts. Maximum boost 20dB....(added
03/04/05) |
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3kHz Low Pass Filter Plus Audio AMP - This circuit uses a switched capacitor
filter IC from National Semiconductor to filter signals with frequencies higher than
the 3KHz needed for voice audio. The schematic includes an audio amplifier that is
designed to drive a standard audio head phone. The circuit is described in more detail
in the receiver section of Dave Johnson's Handbook of Optical Through the Air
Communications. (this link is off-site) …. [Designed by David A. Johnson] |
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4 Channel Stereo Audio Selector - The add-on circuit presented here is
useful for stereo systems. This circuit has provision for connecting stereo
outputs from four different sources/channels as inputs and only one of them is
selected/connected to the output at any one time....(circuit added 8/06)
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4 Watt Amplifier - (circuit / schematic added 6/03) |
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45W HEXFET Power Amplifier - An ideal solution to make a good, low cost
power amplifier ….(electronic schematic added 11/08) |
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4-Transistor Amplifier for Small Speaker Applications - The circuit above
shows a 4-transistor utility amplifier suitable for a variety of projects including
receivers, intercoms, microphones, telephone pick-up coils, and general audio
monitoring. The amplifier has a power isolation circuit and bandwidth limiting to
reduce oscillations and "motorboating"....(Circuit design added 05/05/05) |
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4-Transistor Transmitter (Paul C. Sherby) - This circuit provides an FM
modulated signal with an output power of around 500mW. The input microphone
pre-amp is built around a couple of 2N3904 transistors (Q1/Q2), and audio gain is
limited by the 5k preset trim potentiometer. The oscillator is a Colpitts stage,
frequency of oscillation governed by the tank circuit made from two 5pF ceramic
capacitors and the L2 inductor.... [Tony van Roon's circuit] |
