Peavey CS-400 Schematics Wanted - Page 2 - diyAudio
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Old 20th October 2004, 07:46 AM   #11
djk is offline djk
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The DDT in the CS series amplifiers has a 555 timer in the circuit to delay the action of the limiter to allow the unit to be driven into clipping for brief periods of time.
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Old 21st October 2004, 12:55 AM   #12
Enzo is offline Enzo  United States
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That is not the case. There are no 555s in the CS amplifiers. There have been several versions of the CS400, CS800 and others. None have had timer chips in them.

What would be the point in letting an amp clip for a moment before stopping it? That would sound awful.
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Old 21st October 2004, 08:42 AM   #13
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Amplifiers with instantaneous limiters sound anemic.

Clipping for short intervals of time is virtually inaudible.

Anyone with an o-scope can verify the opperation of the DDT, it allows clipping for a brief interval. Use tone burst of music as a test signal.

You want to buy my CS800?
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Old 22nd October 2004, 06:16 AM   #14
Enzo is offline Enzo  United States
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Your claim was that there is a 555 in the CS amps. Whether or not a small amount of clipping is audible is a separate issue. There is no 555 in these amps. I verified that by looking at the drawings for all the CS series - CS400,800,900, 1000, 1200. ANd among those are several variants. Not one has a 555. My shop has been a Peavey authorized service center for 18 years, and at no time have I seen a 555 in any of their power amps.

The DDT is level activated, so it does nothing until the threshold is reached. Can you beat it with a fast pulse? Probably. Most peaks are bottom and and they round off very nicely.
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Old 22nd October 2004, 07:16 PM   #15
mikeks is offline mikeks  United Kingdom
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I could be wrong, but going by their schematics, i have never seen a Peavey amp. worth spending a penny on...
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Old 23rd October 2004, 04:43 AM   #16
Enzo is offline Enzo  United States
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It all depends on what you want to do with the amp. As a touring musician, the Peavey stuff is quite reliable and sturdy, it can be serviced anywhere in the world, the company still stands behind products that are 30 years old. I can still buy parts for most anything they ever made. You get a lot more amp for your money than buying some other brand, and their customer support is head and shoulders above anyone else in the business. My shop is authorized by most of the major brands, so I work with all the makers. Peavey is consistently the most supportive.

It may not be hifi, but for playing music in clubs it works well. Other popular brands like Crown and QSC make fine products too, but they tend to be more esoteric and complex and service facilities are fewer and farther between. Brands like Mackie I don't even want to work on.
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Old 23rd October 2004, 05:30 AM   #17
mikeks is offline mikeks  United Kingdom
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Horses for courses i suppose...
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Old 12th July 2006, 11:57 AM   #18
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Hello i have a peavey cs-400 o don't really intend to remake it because ai don't think it is complete

In its case i found a small pcb with 3w 2kohms rezistors and some other stuff

what could it be

other thongs i didn;t found except another pcb tighted to the heat sink
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Old 13th July 2006, 12:29 AM   #19
Enzo is offline Enzo  United States
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If you refer to a small - perhaps 60mm on a side? - board on the bottom, it is a zener regulated supply for the low voltage circuits.

There are not a lot of boards in the amps. The heat sink assemblies have the power transistors, and a driver board mounts to the underside of that, one for each channel. There are no other boards. I am sorry, there is a small board on the front for each volume control.
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Old 13th July 2006, 12:57 AM   #20
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You are right about the regulator
On my case i found that small pcb the one on the radiator thoes 2 from the front and another one in the back

I found the schme but only for cs800
If you can help me with somthing more will be great but i don't know if it's worth to revive this amplifier or build another one in it's case

if some one wants the schemes of the cs800 please send me a private message because i can't upload it in here

ViceLord send his regards
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