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 .
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It does what I ask and more.
Moving magnet phono pre-amplifier – 2. Mute switch is a mechanical switch of the output. All material is provided “as is” with no guarantees or warranties, either express or implied.
To make both parts look alike I used two plastic project boxes from Radio Shack. Note that C1 must be non-polar.
RJM Audio – LM Non-inverting Gainclone
Diodes should be rated to at least 5A. These are conservative figures and in practice even a VA transformer will be found to be quite sufficient. After listening to the tube-chip ,m3875 for a while, I really would have loved to have this quality of sound reproduction at any time in the past.
If you have looked at the other projects on the site you will see that a modified K is my primary serious listening amp. 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.
This is the capacitor I chose, its an Elna Starget expensive.
Nanoo – DIY LM3875 Gainclone (IC / Chip Amplifier)
That is, a single integrated circuit based on an operational amplifier op amp on a single substrate of silicon. Carbon resistors are used throughout. Dual bridge rectifiers lj3875 shown above. Now back to the amp.
It also analyzes transistor’s characteristics such as voltage and gain. I wont go on, it just sounds amazing and its so cheap to build! Headphone amplifier is small enough to fit in L,3875 tin box, and thanks to low power consumption may be supplied from a single 9V battery.
The data sheets for the LM and its smaller cousin the LM are very informative. This result is shown below:.
With all the hype on chipamps, I wanted to evaluate it for myself before I got serious about making it look pretty. Headphone amplifier is small enough to fit in Altoids tin box, and thanks to low power consumption may be supplied from a single 9V battery.
56W Audio Power Amplifier Using LM – Circuit Ideas I Projects I Schematics I Robotics
I used the optional Ci capacitor in the national datasheet for the IC which reduced it to between mV: The meter is a perfect addition to any power supply, battery chargers and other electronic projects where voltage and current must be monitored. Lk3875 is soldered directly between the leads of the IC, which is itself tucked underneath the board together with R2 and R5.
There seemed to be something going on in the upper ranges that I just couldn’t define. The power supply found a home in an old computer printer switch enclosure. Signal to noise is extreme. Still the basic set up was rather utilitarian, I wanted a distinctive look. Horns and percussion are great. Over a period of days either my ears went south or it got mellower. I next tried bigger filters, but took them out in favor of the uF Panasonics that came with the kit.
The next step was to get everything into the boxes. Pretty nice sound, not top of the heap, but not trash either. But being lk3875 bit of a conservative guy translation, I like to do things cheaply if I can I couldn’t find a suitable enclosure for the project. Click here for photos. I didn’t include a Zobel network less is better again and didn’t have any problems.
I sat back to listen. That way I have no preconceived ideas about how something should sound based on the measurements. The umbilical cord is heavy duty with two of the four wires supplying earth. I was fascinated by the Patek – which is lm875 based on the LM op-amp chip.