The people at [ElectroSmash] just recently released 1Wamp – a one watt, open hardware, Guitar amplifier packed with features. It consists of a JFET based pre-amplifier, a huge Muff Pi a.k.a BMP based Tone manage as well as an LM386 power amplifier. The double JFET pre-amp supplies tube-like sound, the BMP supplies a great tonal variety while the LM386 can drive different kinds of output’s ranging from headphones to speaker cabinets.
1Wamp had controls for Tone, volume as well as Gain, a Speaker/Cabinet output, a headphone output with an integrated attenuator switch as well as an aux. input. The aux. input is helpful as it adds any type of line level input signal to the guitar sound, enabling you to method with metronome or MP3 backing tracks or drum bases. It runs off either a 9V battery or can be powered by means of an outside power source. [ElectroSmash] have released all the native KiCad style files. If you’d like a quick look at the design, inspect out the Schematic PDF as well as the expense of Materials. There’s likewise a helpful assembly handbook [PDF] that shows exactly how to develop it in five simple steps.
Their blog publish supplies very in-depth circuit analysis of every part of the design, starting from the power supply filter to eliminate mains “hum” all the method with to PCB design considerations for noise reduction. Oscilloscope screen shots supply signal analysis showing bias points as well as signal levels throughout the circuit. The option of value for each element is explained, together with the consequences of altering those values. This makes it simple to customise the 1Wamp to fit private tastes. We likewise observed flavor designs for the suggested as well as alternate JFET transistors, in situation you requirement to customise the style by altering element values.
There’s likewise a great deal of audio amplifier trivia, references as well as links shared in their post. This includes a in-depth analysis of the LM386 op-amp. want to add some bling to your 1Wamp build? There are a great deal of handy ideas on exactly how to add great LED illumination to the amplifier if it is mounted in a common metal enclosure. However, the PCB has some truly great graphics, so an acrylic-sandwich-type enclosures look best. inspect out the video that walks with the features of the 1Wamp as well as shows off its performance. as well as while on the subject of Audio electronics, here’s one of their earlier jobs – an open source Arduino guitar pedal.
Documentation to this level proves a number of things, a lot of notably a like for this style as well as deep consideration for those who will utilize as well as customize this amplifier. It’s a great pattern to comply with with your own open source designs.