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Chip Amps Amplifiers based on integrated circuits

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Old 25th May 2010, 08:07 PM   #1441
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Quote:
Originally Posted by Prophetmaster View Post
The line input cannot be placed so close from the speakers output and power supply input
There was not that much room left at the back to space them wider apart. So I agree with you, but I didn't do it.
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Old 26th May 2010, 07:54 AM   #1442
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Quote:
Originally Posted by jeronimo2003 View Post
There was not that much room left at the back to space them wider apart. So I agree with you, but I didn't do it.
I see. In this case, variants are not present
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Old 13th June 2010, 09:01 PM   #1443
ted is offline ted
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Default The weekend amplifer

A weekend amplifier, when something small is fun. Based on a TDA-7266 using an external 9V wallwart.
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Old 14th June 2010, 10:03 PM   #1444
Dr_EM is offline Dr_EM  United Kingdom
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Default Mini LM1875 based desktop amp

Just finished! A headphone jack may be added is the only thing:

Click the image to open in full size.
Click the image to open in full size.

Full details and more pics in the build thread:

LM1875 miniature desktop amplifier build




Ted, I like that, how the heatsink extends out of the wooden box. That seems like quite a nice performing chip too actually
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Old 24th June 2010, 09:36 AM   #1445
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I am new to this website and i like very much what i see here. Good job guys.
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Old 26th June 2010, 12:07 PM   #1446
Previously: Kuei Yang Wang
 
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Hi,

I guess I'm rather late to the Party, at least with build pictures.

You could say the first ever Amp I build was a chipamp too, very long ago (some time in the early to mid 70's IIRC). It was based on the east german copy of the TBA810AS Chip (A205K), but it had discrete single transistor preamp for tone control and of course obligatory loudness volume control. Of course, this was build all proper on a Circuit board, hand drawn and eteched in iron cloride or whatever this nasty stuff is and then drilled by hand.

Working with some 8" full range drivers taken from old tube TV's and using a portable FM Radio (fitted DIY with a Stereo Decoder) as source this sounded quite nice, to my very, very young self.

I build quite a few Amplifiers with Chips later, long before the "Chipamp" became a household name. In the early days of gaincloning I had my fingers in the pie too and I still am occasionally attributed the "inverting gainclone" (Hardly my design, anyone can use a chipamp inverting, it's right there in Horrowitz & Hill).

A few years back I needed a temporary but Decent Amp so I build a Gainclone in the case an old old blown up up amplifier, namely an Audio Innovation Alto:

Click the image to open in full size.

The Insides look a little more chaotic, practically everything is hardwired:

Click the image to open in full size.

The transformer inside was perfect for a gainclone, so it stayed.

The Powersupply combines a little of everything, or should I just say my own take. I used MUR860 (On-Semi) mainly because I had them around, I normally prefer schottky diodes.

Click the image to open in full size.

The PSU Capacitors are 3,300uF/50V Elna Silmic II. The first pair is directly after the rectifiers, unbypassed. Each of the three lines (+V, -V and gnd) then connect via a pair of parallel 0.47 Ohm resistors to the second pair of capaictors, which are bypassed and snubbered (ThanX Carlos).

PSU Wiring is 1mm solid silver in PE Tubing pulled from my favourite RF Coaxial Cable, three strands per connection carrying +/-/gnd. Star wired to each Amp section and to the speaker binding posts.

For a number of reasons this Amp is non-inverted, bog standard App Note Circuit, but with local Elna Silmic II PSU Cap's (100uF/50V IIRC) and AB Carbon Composite Resistors (handselected for perfect channel match).

Click the image to open in full size.

Frontend is a genuine Alps Blue motorised pot (not china fakes) with the silcone chip remote control kit. I could have used a Noble Pot but that would have meant no remote control, I am getting lazy in my old age.

Relay based input switching (forgot whose' relays, some nice ones), signal wiring is silver, 1mm for grounds and 0.2mm for each signal, again using these salvaged coax cables, here the shield was left in place.

That's it.

The Amp sounds quite okay, it beat the stuffing out of a Naim Nait and several other pretty expensive SS Amp's, it readily looses against any of my Tube Amp's though. Currently it gathers dust, so I'll probably break this apart some time soon to put something else inside.

Ciao T

PS, yes, I have the matching CD-Player...
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Old 26th June 2010, 10:03 PM   #1447
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Nice one Thorsten. Beaut case too!
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Old 27th June 2010, 07:44 AM   #1448
Puffin is offline Puffin  United Kingdom
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Quote:
Originally Posted by ThorstenL View Post


PS, yes, I have the matching CD-Player...

I have the CD player with the Audio Partnership boards inside. Got it broken for 20. I think it sounds great. What is your opinion? I have tried to see what Dac it uses. Do you know?
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Old 27th June 2010, 10:47 AM   #1449
Previously: Kuei Yang Wang
 
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Hi,

Quote:
Originally Posted by Puffin View Post
I have the CD player with the Audio Partnership boards inside. Got it broken for 20. I think it sounds great. What is your opinion? I have tried to see what Dac it uses. Do you know?
The CD sounds okay to my ears, after quite a few modifications.

The DAC is CS4327, the last decent sounding DAC Cirrus Logic ever made, basically a budget version of the CS4328 which was justly famous in it's day.

The PCB's are basically the same as one particluar Cambridge Audio CDP.

It was designed by John Westlake of triangle fame (who occasionally posts here).

My mods where mainly "Os-Con plus SMD Ceramics everywhere"; I upgraded the Op-Amp's (AD8620 for output I remember, one other which regulates the reference voltage where I used a nice fast low noise one, can't remember which).

BTW, neither Amp nor CD are used in my main system anymore, in fact both collect dust.

Here is what is playing right now:

Audio Asylum - Inmate Systems

Ciao T
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Old 28th June 2010, 02:59 AM   #1450
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Very, very stylish ... lovin' it.
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