small power amplifier Archives - Amplifier Circuit Design https://amplifiercircuit.net/tag/small-power-amplifier Amplifier Project Schematic Diagram Sat, 14 Jul 2012 18:19:13 +0000 en-US hourly 1 103688205 12W FET audio amplifier https://amplifiercircuit.net/12w-fet-audio-amplifier.html https://amplifiercircuit.net/12w-fet-audio-amplifier.html#comments Sat, 14 Jul 2012 18:19:12 +0000 http://amplifiercircuit.net/?p=1508 This is a small 12W power amplifier on a load of 8 Ω, that combining the NE5534 integrated technology with […]

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]]> 12W audio amplifier F.E.T.This is a small 12W power amplifier on a load of 8 Ω, that combining the NE5534 integrated technology with transistors as V-MOSFET output stage get an excellent sound quality. The input sensitivity is 3V rms maximum, the distortion factor is 0.002% at 1 kHz, and frequency response is 15 Hz to 100 kHz. (-3dB).

12W FET audio amplifier  parts list :

R1 33 kΩ C1 1nF 63V D1 1N967B zener 18V 0.5W
R2 6.8 kΩ C2 47 µF 40V D2 1N967B zener 18V 0.5W
R3 22 kΩ C3 100 nF 63V D3 1N4148
R4 100 kΩ C4 100 nF 63V D4 1N4148
R5 1 kΩ C5 47 µF 40V Q1 2SK135
R6 330 Ω C6 4.7 pF ceramic Q2 2SJ50
R7 1 kΩ C7 100 µF 40V IC1 NE5534
R8 10 kΩ C8 100 µF 40V
R9 0.47 Ω 2W
R10 0.47 Ω 2W
R11 10 kΩ

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]]> https://amplifiercircuit.net/12w-fet-audio-amplifier.html/feed 2 1508 Max 1W / 8 Ohms Amplifier based on LM386 with Input for Guitar https://amplifiercircuit.net/max-1w-8-ohms-amplifier-based-on-an-lm386-with-input-for-guitar.html https://amplifiercircuit.net/max-1w-8-ohms-amplifier-based-on-an-lm386-with-input-for-guitar.html#respond Mon, 05 Dec 2011 03:27:28 +0000 http://amplifiercircuit.net/?p=763 This 1 watt amp is very easy to built in very small dimensions, working with only single 9V battery, and […]

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]]> guitar amplifier for beginnersThis 1 watt amp is very easy to built in very small dimensions, working with only single 9V battery, and is based on amplifier IC type LM386, its capable to deliver a power for some hundreds milliwatts to 8 ohms load, while consuming only a few mA at rest.

Associated with a small FET input stage, this amplifier is ideal for beginners to make some small electric guitar amplifier. Don’t think you will get results similar to those offered by the amps of a certain class, but for someone who starts in the DIY, and choosing a good size of speaker driver, it’s a nice little montage.

Possible simplification :

  • A component that you can try to remove: R4 + R5 + C7 C5, C6. And finally, you can also try to remove R6 and C8, while not forgetting to replace R6 with a strap (for short circuit, if you prefer), just to see what happens when at maximum volume.
  • The number of components in the preamp section can be reduced … a different preamp and easier. Maybe you’ve seen a small preamp with two resistors and a FET type PN4221: it is very difficult to get any easier, but these transistors is outdated. You can experiment with other types of general FETs.

PCB Layout

guitar amplifier

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