Folks: I have finished four LMbased amps using Brian Bell’s terrific PCBs and am thrilled with the result. But as I follow the various threads. LM OvertureTM Audio Power Amplifier Series High-Performance 56W Audio Power Amplifier. The is a high-performance audio power amplifier capable of. Gainclone amplifiers have VERY few components and this one is based on the National Semiconductor LM IC. The PCBs and components are very simple .

Author: Vile Shakamuro
Country: Albania
Language: English (Spanish)
Genre: Relationship
Published (Last): 3 June 2017
Pages: 283
PDF File Size: 2.63 Mb
ePub File Size: 18.66 Mb
ISBN: 479-5-40535-149-4
Downloads: 42108
Price: Free* [*Free Regsitration Required]
Uploader: Gumi

Testing the assembled amps on a desk. A while back, Gio introduced me to the concept of chip amplifiers gainclones.

Lm38775 actually bought the parts. I would recommend VA as the absolute minimum transformer rating for stereo operation, with VA being a good compromise between cost and performance. When driven by my solid state Velleman preamp the amp was detailed and accurate. For stereo operation, the transformer may be rated between VA to VA.

Two ground points are defined, the base of R2 is the signal ground S and the base of L3m875 the power ground P.

You can control lights, fans, AC system, computer, printer, amplifier, robots, garage door, security systems, motor-driven curtains, motorized window blinds, door locks, sprinklers, motorized projection screens and anything else you can think lm38775. Conclusion I haven’t heard sound this good before. That is always a concern when something is powered by a watt transformer.


RJM Audio – LM Non-inverting Gainclone

C2 is most likely also omitted. I figured or uF would be better. The data sheets for the LM and its smaller cousin the LM are very informative.

I had no idea a better amp would make a such a big difference to my system. To make both parts look alike I used two plastic project boxes from Radio Shack.

For sheer power and presence the tube-chip combo is excellent. They come with snap in jacks of all types. Moving magnet phono pre-amplifier – 1. This LC Meter allows to pm3875 incredibly small inductances making it perfect tool for making all types of RF coils and inductors. This LC Meter allows to measure incredibly small inductances making it perfect tool for making all types of RF coils and inductors.

My system has two kinds of equipment, those that stay l,3875 all the time and those that get turned on with a master switch. It cooked for several days as I forgot to turn it off. And its its an easy and safe project to build. There seemed to be something lm385 on in the upper ranges that I just couldn’t define. To maximise thermal transfer between the IC and the heat-sink, the insulating mica washer may be omitted.

Four FE5D diodes are used for rectification. A look at the images reveals just how small this amp is.


It is understood that Kimura removed the film bypass caps C3 and C4, and R1 on the circuit will be replaced by the stepped attenuator. For the first few hours it was kind of bright really it was too bright for my tastes.

I’m hard to please and always looking for new things to try in audio. Km3875 is a very useful bench test equipment for testing and finding out the frequency of various devices with unknown frequency such as oscillators, radio receivers, transmitters, function generators, crystals, etc.

DIY LM3875 Chip Amplifier (Gainclone) Kit

In general, though, the capacitors affected the sound more than the resistors, lj3875 diodes more than the capacitors, and the transformer most of all. This result is shown below: Small, powerful and flexible but most of all, when properly implemented, very musical and very natural. The circuit is based on the typical application given in the datasheet but with a few changes as follows: The transformer should be rated to around VA and be either a torroid, R-core or C-core type with dual secondary windings of 16 VAC.