Integrated amplifier

Brownlow · 25th September 2001, 08:47 AM

Hi,

I am looking at a design for an integrated amplifier, which delivers about 60-80W per channel. I guess that this question could have been covered elsewhere before so maybe someone could refer me to previous pages.

What would be the best (and cheapest) source for pots in the UK?

All ideas and info appreciated.

Thanks.

paulb · 25th September 2001, 01:25 PM

I was looking for cheaper ones, but ensuing discussion gave lots of possibilities:
Cheaper, good quality potentiometers

Brownlow · 26th September 2001, 08:34 AM

PaulB

Thanks for the reply about the pots. Would you know of a design for an integrated amp, 60/80wpc? I would like to build something where I can get a solid performance. You may know of some sites where I could get the circuits, have you built anything like that yourself in the past?

paulb · 26th September 2001, 01:19 PM

Hi, here's a good site for ideas on amp projects:
http://www.sound.au.com/index.html
Project 3A or 19 might interest you, there are others. Rod sells circuit boards for these ones, so it's a good way to start.
I also suggest you look through some of the older threads in this forum, there's lots of ideas here. You'll find that many people are at the far end of normal as far as what they like. There are some very esoteric designs here.

GRollins · 26th September 2001, 04:25 PM

There's nothing to prevent you from choosing a preamp and amp separately, then combining them in the same chassis. You need not feel limited to published designs.

Grey

promitheus · 26th September 2001, 09:08 PM

You can check these elektor projects that are very reliable and you can buy pcb´s in the UK.
http://members.tripod.de/Promitheus/projects.htm

Brownlow · 27th September 2001, 06:33 PM

PaulB,

Thanks for your contributions as well as those from Grey and Promitheus. My next query is if you were to use different pre/power circuits, would you have one power supply and lower the voltage for the preamp using regulators? If so which ones would you use? I appreciate these may be basic questions, but it would help me immensely.

Many thanks.

Brownlow

paulb · 27th September 2001, 07:16 PM

Again, it depends: complexity versus potential audio quality. My feeling would be if they're in the same box, use the same supply. But there would likely be an improvement to going to separate supplies (even separate supplies per channel). Whether you could hear the difference, I don't know. It could get out of hand very quickly.
If you are fairly new to this, I'd go for simplicity. You could always wire it such that you could do it either way and upgrade later.
For preamps, I generally put regulators right on each board for flexibility. I also put power supplies in their own enclosure. My current system has 3 boxes: preamp, power amp, and a box that has separate power supplies for the preamp and power amp.

promitheus · 27th September 2001, 09:37 PM

If you use a preamp that needs lower voltages than the amplifier you can go along with regulation with simple Ic regulators (lm78xx,lm79xx,lm317,lm337). It won´t reduce the quality and it´s cheap. But it all depends on what you use. A very economic solution is to use a passiv preamp in front of the amp in the same box, or use a simple preamp with one stage opamp.

GRollins · 27th September 2001, 09:46 PM

Brownlow,
Unless you've got a wide mismatch in rails, such as a tube preamp and a solid state amp, you'll be okay with one power supply. If the front end needs a lower rail, you can drop the voltage with resistors or regulators. If it needs a higher rail, you can use a voltage doubler.

Grey

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25th September 2001, 08:47 AM	#1
Brownlow diyAudio Member Join Date: Apr 2001 Location: UK	Hi, I am looking at a design for an integrated amplifier, which delivers about 60-80W per channel. I guess that this question could have been covered elsewhere before so maybe someone could refer me to previous pages. What would be the best (and cheapest) source for pots in the UK? All ideas and info appreciated. Thanks.

25th September 2001, 01:25 PM	#2
paulb diyAudio Member Join Date: Jun 2001 Location: Calgary	I was looking for cheaper ones, but ensuing discussion gave lots of possibilities: Cheaper, good quality potentiometers

26th September 2001, 08:34 AM	#3
Brownlow diyAudio Member Join Date: Apr 2001 Location: UK	PaulB Thanks for the reply about the pots. Would you know of a design for an integrated amp, 60/80wpc? I would like to build something where I can get a solid performance. You may know of some sites where I could get the circuits, have you built anything like that yourself in the past?

26th September 2001, 01:19 PM	#4
paulb diyAudio Member Join Date: Jun 2001 Location: Calgary	Hi, here's a good site for ideas on amp projects: http://www.sound.au.com/index.html Project 3A or 19 might interest you, there are others. Rod sells circuit boards for these ones, so it's a good way to start. I also suggest you look through some of the older threads in this forum, there's lots of ideas here. You'll find that many people are at the far end of normal as far as what they like. There are some very esoteric designs here.

26th September 2001, 04:25 PM	#5
GRollins diyAudio Member Join Date: Feb 2001 Location: Columbia, SC	There's nothing to prevent you from choosing a preamp and amp separately, then combining them in the same chassis. You need not feel limited to published designs. Grey

26th September 2001, 09:08 PM	#6
promitheus diyAudio Member Join Date: Jan 2001 Location: Germany	You can check these elektor projects that are very reliable and you can buy pcb´s in the UK. http://members.tripod.de/Promitheus/projects.htm

27th September 2001, 06:33 PM	#7
Brownlow diyAudio Member Join Date: Apr 2001 Location: UK	PaulB, Thanks for your contributions as well as those from Grey and Promitheus. My next query is if you were to use different pre/power circuits, would you have one power supply and lower the voltage for the preamp using regulators? If so which ones would you use? I appreciate these may be basic questions, but it would help me immensely. Many thanks. Brownlow

27th September 2001, 07:16 PM	#8
paulb diyAudio Member Join Date: Jun 2001 Location: Calgary	Again, it depends: complexity versus potential audio quality. My feeling would be if they're in the same box, use the same supply. But there would likely be an improvement to going to separate supplies (even separate supplies per channel). Whether you could hear the difference, I don't know. It could get out of hand very quickly. If you are fairly new to this, I'd go for simplicity. You could always wire it such that you could do it either way and upgrade later. For preamps, I generally put regulators right on each board for flexibility. I also put power supplies in their own enclosure. My current system has 3 boxes: preamp, power amp, and a box that has separate power supplies for the preamp and power amp.

27th September 2001, 09:37 PM	#9
promitheus diyAudio Member Join Date: Jan 2001 Location: Germany	If you use a preamp that needs lower voltages than the amplifier you can go along with regulation with simple Ic regulators (lm78xx,lm79xx,lm317,lm337). It won´t reduce the quality and it´s cheap. But it all depends on what you use. A very economic solution is to use a passiv preamp in front of the amp in the same box, or use a simple preamp with one stage opamp.

27th September 2001, 09:46 PM	#10
GRollins diyAudio Member Join Date: Feb 2001 Location: Columbia, SC	Brownlow, Unless you've got a wide mismatch in rails, such as a tube preamp and a solid state amp, you'll be okay with one power supply. If the front end needs a lower rail, you can drop the voltage with resistors or regulators. If it needs a higher rail, you can use a voltage doubler. Grey