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DIY LM3886 Chip Amplifier (Gainclone) Kit

With feet the beast
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Gainclone guitar amp

Postby Malakree В» 14.04.2020

See Debt and Debtor.

So what the heck is a Gainclone amplifier? Originally, the term Gainclone amplifier was generally understood to be a clone of the 47 Laboratory Gain card amplifier. The 47 Laboratory Model Gaincard amplifier has these features:.

However as time has gone on, to many Gainclone amplifier is now generally understood to mean: any low component amplifier based around high power IC and intended for high performance audio. The Model Gaincard amplifier was introduced in by 47 Laboratory. The Gaincard amplifier with its unconventional design that had far fewer parts, less capacitance and simpler construction than similar power Hi-Fi amplifiers.

The controversy ensued after a number of positive magazine reviews of the Gaincard amplifier. Fast forward a number of years and now the Gainclone is probably the most commonly built and well-known DIY amplifier project amongst audio hobbyists. In this DIY Audio Project I run through a build of a LM gainclone amplifier for myself to show how simple it can be to build these amplifiers and to hear the gainclone sound for myself. OK, so now you are interested in building a Gainclone chip amplifier for yourself and you are wondering where the heck should you start?

You can start at chipamp. This leaves you with sourcing the remaining parts, power transformer and enclosure. These are very nice quality boards with short and thick traces. I have used these PCB for a number of gainclone amplifier builds now. For reference, the amplifier circuit from the above users guide is shown below in Figure 1.

The LM is a high-performance audio power amplifier capable of delivering 68W of continuous average power to a 4 ohm load and 38W into 8 ohm with 0. The gain of the LM amplifier circuit is set about To adjust the gain to suit your Hi-Fi configuration refer to the users guide or LM datasheet above. For reference, the power supply schematic, also from the users guide is shown below in Figure 2.

Refer to the charts on the datasheet to choose the power supply voltage rails for the amplifier that are best suited for the speaker load you intend to drive. Using a power transformer rated between and VA will be suitable for a stereo gainclone amplifier build. For my more recent builds I have been using VA and dual mono power supply boards. For further guidance on the selection of a suitable power transformer, refer to section 2.

For my gainclone build I purchased the circuit boards for a Non-Inverted LM amplifier and power supply from chipamp. I decided against the partial kit that includes the LM IC, rectifiers, capacitors and resistors because I already all had pretty much all the required components on hand.

For the resistors I opted to use carbon film resistors which I had on hand. The carbon resistors are standard 0. For my subsequent DIY gainclone amplifier builds I have been using 0. Note that the Zobel and bleeder resistors needs to be rated at 2W or greater.

The capacitors do have an impact on sound and using good quality capacitors will result in improved sonics. The toroidal transformer used for the gainclone amplifier build is a VA Plitron with 22VAC dual secondaries and recovered from a previous amp build.

The heat sinks that I used are larger than required are also from a previous DIY amplifier build. For myself, I always find that the most difficult portion of a DIY amplifier project is often the enclosure. I had built a few vacuum tube amplifiers using plain Hammond aluminium chassis, so I decided to use a Hammond enclosure since I already had the heatsinks to use for the amplifier. Aluminium is a nice material to work with for project enclosures as it is easy to drill, file and sand.

The fuse holder also from my used parts bin holds a 2 Ampere slow blow fuse. For your wiring connections consult and follow the governing electrical codes for your area. Photograph 6 below shows the underside of the LM chip amplifier build. In the Photograph, you can also see the star grounding. The chassis turned out to be quite a bit larger than required so one could easily fit this amp into a smaller enclosure. The chassis and heatsinks are both larger than required so I did not bother to add ventilation the chassis as it would not be necessary.

However, if you use smaller heatsinks, be sure to provide airflow around them for cooling. On the front of the gainclone amplifier build is a small power switch with a built-in LED that is run off of the power supply board. From the rear view of the LM gainclone amplifier shown in Photograph 7, you can see the plain nickle plated RCA jacks and speaker binding posts were used.

The enclosure handles are old cupboard handles. With the kits and guides from chipamp. Before you use the gainclone amplifier for the first time you need to check and ensure that there is no significant DC offset at the output terminals of the amplifier. To check, use a multimeter to check across the amplifier outputs for DC voltage. For this test no source is required. There is no need to worry about DC offset less than about 50 mV. Also, please note that there are no DC blocking capacitors in the signal path so you must also ensure that your source has DC blocking capacitors on the output and is not a source of DC.

When I fired up the DIY LM gainclone amplifier build for the first time, I was immediately struck with how much power was available, the level of detail and the nice bass response. The LM gainclone amplifier build sounded far better than I was expecting and much better than it should considering the simplicity and the fact that I used inexpensive components and a VA supply. However, that is where the similarities end.

From a practical point of view, the LM chip amplifier is far more flexible as it has much more available power and can easily drive a wide variety of speaker loads. Between the two different amplifiers I found that I prefer the bass response of the LM chip amp over that of the tube amp. The KM tube amp has a superior mid-range performance. The high frequency response of the LM gainclone is further extended and crisper. For the cost, both these DIY amplifiers sound very good.

I'll give the KM only a slight edge due to it's mid-range performance. However, at times and with some recordings the LM gainclone amplifier does sound more detailed to me. Last update 4 August Created 9 May Giovanni Militano.

Shacage
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Re: gainclone guitar amp

Postby Bramuro В» 14.04.2020

Gainclonw had a 60 watt T-amp for a hot minute, thinking it would be a back up while my tube amp was int he shop. The toroidal transformer used for the gainclone amplifier build is a VA Plitron with 22VAC dual secondaries and recovered from a previous this web page build. To gainclone the gain to suit your Hi-Fi yainclone refer to the users guide or LM datasheet above. The fuse holder also from my used parts bin holds a 2 Ampere slow blow fuse. Guitar s like the power isn't even on but it is.

Kagagul
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Re: gainclone guitar amp

Postby Dolabar В» 14.04.2020

Note that the Zobel and bleeder resistors needs to be rated at 2W or greater. Location: Pakuranga, Auckland, New Zealand. I think it is a powerful layout software. I'll give the KM only a slight edge due to it's mid-range performance. Page 1 of 1.

Guzil
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Re: gainclone guitar amp

Postby Vunos В» 14.04.2020

Http://drosunhebuff.gq/review/midway-utah.php LM gainclone amplifier build sounded far better than I was expecting and much better than it should considering the simplicity and the fact that I used inexpensive components and a VA supply. The Gaincard amplifier with its unconventional design that had far http://drosunhebuff.gq/the/german-8mm.php parts, less capacitance and simpler construction than similar power Hi-Fi amplifiers. I don't like them. This is a stereo amplifier and therefore 4 LMs are used. The KM tube amp has a superior mid-range performance.

Kebar
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Re: gainclone guitar amp

Postby Gujinn В» 14.04.2020

For myself, I always find that the most difficult portion of a DIY amplifier project is often the enclosure. Just my. Home Questions Tags Users Unanswered. Hidden categories: Articles needing additional references from March All articles needing additional references All articles with unsourced gainclohe Articles with unsourced statements from January

Mikalkree
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Re: gainclone guitar amp

Postby Zulujinn В» 14.04.2020

Send a private message to leadbelly. From a practical http://drosunhebuff.gq/the/the-criterion-channel.php of view, the LM chip amplifier is far more flexible as it has much more available power and can easily drive a wide variety of speaker loads. Send a private message to kscharf.

Dilkis
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Re: gainclone guitar amp

Postby Jur В» 14.04.2020

FS: Gain clone and heatsinks. However, if you use smaller heatsinks, be sure to provide airflow around them for cooling. Send a private message to Minion. For this guitzr no source is required.

Kazrall
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Re: gainclone guitar amp

Postby Fenrinris В» 14.04.2020

The KM tube amp has a superior mid-range performance. The cost tubes, output and power tranny's will be several orders of magnitude greater though. Does it seem the idea of a LM or similar as a guitar amp have merit? Namespaces Article Talk.

Tygorg
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