Pure Class-A Headphone Amplifier Schematic
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Super Triode Connection (STC) Amplifiers
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Band 2 Preamplifier
The circuit uses two 2N3819 FET`s in cascode configuration. The lower FET operates in common source mode, while the upper FET, operates in common gate, realisin...
TDA2030 8w Amplifier
Although the TDA2030 is capable of delivering 20 watts of audio power, I deliberately reduced the output to about 8 watts to drive 10 watt speakers. This is mor...
Quadraphonic Amplifier
This is a four channel amplifier ideally suited for use with quadraphonic equipment such as a Sound Blaster Live card. There is no volume control, audio levels ...
Low Voltage Preamplifier
This is a special low voltage version of my audio preamp. T1`s emitter voltage is biased close to half supply voltage (1. 5V) to allow for maximum output voltag...
Op-Amp Microphone Preamp
A high quality microphone preamplifier using a single power supply, suitable for dynamic or electret microphones. The op-amp used can be any low noise, high per...
ECM Mic Preamplifier
Both transistors should be low noise types. In the original circuit, I used BC650C which is an ultra low noise device. These transistors are now hard to find bu...
electret microphone amplifier
Level refers to the relative strength of the signal and is measured in decibels. LINE level sources are much-amplified signals over MIC (microphone) level signa...
Nine Tube Stereo Amplifier 1
If you want to omit this balance control, such as when using separate pots for the volume controls, see the balance control notes on the 7-tube output amplifier...
7 Tube Stereo Output Amplifier
This is a 7 tube 20 watt amplifier that must be used in conjunction with a pre amplifier having volume an tone controls. For this, I recommend this 6 tube pre-a...
A 4 Watt Amplifier Portable RadioCircuit Design using TDA1011
The following schematic depicts the design of a 4 Watt Amplifier Circuit Diagram for portable radio application using TDA1011 from Philips Semiconductor. The.....
20W Car Radio Power Amplifier using TDA2005
The TDA2005 is class B dual audio power amplifier package specifically designed for car radio application. You can easily design car radio power booster.....
JFET-Bipolar Cascode
The following schematic shows the JFET- Bipolar Cascode Circuit Diagram. The JFET- Bipolar cascode circuit will provide full video output for the CRT cathode dr...
TDA 2030 8W Audio Amplifier
TDA 2030 audio amplifier can output 20 W but in this schematic we have reduced the power to 8w and we use 10w speakers. The input sensivity is around 200mV and ...
LM317 audio amplifier
You probably know that LM317 IC is used as an adjustable voltage regulator, but did you know it can be used as an audio amplifier? This is a class A audio ampli...
Dynamic mic preamplifier circuit
This mic preamp uses the low noise IC uA739. The circuit is an example of how a good preamplifier can be designed for dynamic microphones. The IC houses two ide...
Audio Mixer with one transistor
This one transistor audio mixer is used in an amplifier circuit design with base driven transistor and with its emitter being current controlled, most of the dr...
70W High Power Amplifier with MOSFET
Here the schematic diagram of 70W power amplifier with MOSFET for your audio system. There are possible alternative input stage transistors, the Toshiba 2SA970B...
2 Watt Mini Audio Amplifier
This circuit is inexpensive, easy and quite simple. This is general audio amplifier which can be used for computer, CD player or other devices which have headph...