My First Gainclone

Puffin · 17th October 2007, 08:01 AM

I am intending to build a gainclone using a TDA 2030, something cheap and cheerful to get me started.

I have obtained a circuit board form RS which provides for a single or dual rail input.

I wonder if someone may be able to answer the following :-

The layout for connections is as follows

Input Common +Vcc -Vcc Output

Would I be right in saying that the input ground goes to Common.

If I use a dual rail supply does this invlove a centre tapped transformer and the Ov goes to Common ?

If I use a single rail supply I forget about connecting to the Common ?

The Output ground goes to Common ?

Is there any benefit in using a Dual rail supply?

Puffin · 17th October 2007, 08:09 PM

Here is the board

http://i73.photobucket.com/albums/i2.../Circuitbd.jpg

Puffin · 19th October 2007, 07:05 AM

I take it I have stumped everyone. Oh well I'll see if I can get it working without blowing it up.

AndrewT · 19th October 2007, 11:12 AM

Could you show us the schematic?

It a lot of work to extract that from your poor pic of the PCB.

Puffin · 19th October 2007, 02:10 PM

AndrewT. I don't have a schematic, but have some more pics which may be clearer.

http://i73.photobucket.com/albums/i2...x/DSCF0350.jpg

http://i73.photobucket.com/albums/i2...x/DSCF0351.jpg

theAnonymous1 · 19th October 2007, 02:28 PM

For a dual supply setup, the signal ground and 0v of the transformer go to "common".

For a single supply setup the signal ground still goes to "common", but the "ground" of the supply connects to -Vcc and then you place a jumper where it says "LINK".

You will also need to use a large capacitor in series with the output with a single supply. I don't see a space on the board for this so it will have to be mounted off board. The TDA2030 schematic uses a 2000uf capacitor for this.

Oops, also the capacitor between -Vcc and ground won't be needed with a single supply.

Puffin · 19th October 2007, 05:29 PM

Anonymous1. Thanks for that. I assume also that the ground for the output goes to common.

Is there anything to be gained from using a dual rail supply ?

theAnonymous1 · 19th October 2007, 06:29 PM

Quote:

Originally posted by Puffin
Anonymous1. Thanks for that. I assume also that the ground for the output goes to common.

Yes, the output is also referenced to common.

Quote:

Originally posted by Puffin
Is there anything to be gained from using a dual rail supply ?

Absolutely; you don't need a capacitor in series with the output.

jacco vermeulen · 19th October 2007, 06:38 PM

Puffy,

this schematic resembles yours for a number of the parts :
http://www.mitedu.freeserve.co.uk/Ci...Audio/tda8.htm
(different of course : 47K=150K, 1.5K=4.7K)

The BOM for the RS PCB : HERE

Puffin · 19th October 2007, 07:52 PM

Thanks Anonymous1 and Jacco.

17th October 2007, 08:01 AM	#1
Puffin diyAudio Member Join Date: Feb 2006 Location: U.K	My First Gainclone I am intending to build a gainclone using a TDA 2030, something cheap and cheerful to get me started. I have obtained a circuit board form RS which provides for a single or dual rail input. I wonder if someone may be able to answer the following :- The layout for connections is as follows Input Common +Vcc -Vcc Output Would I be right in saying that the input ground goes to Common. If I use a dual rail supply does this invlove a centre tapped transformer and the Ov goes to Common ? If I use a single rail supply I forget about connecting to the Common ? The Output ground goes to Common ? Is there any benefit in using a Dual rail supply?

19th October 2007, 11:12 AM	#4
AndrewT diyAudio Member Join Date: Jul 2004 Location: Scottish Borders	Could you show us the schematic? It a lot of work to extract that from your poor pic of the PCB. __________________ regards Andrew T.

19th October 2007, 02:28 PM	#6
theAnonymous1 diyAudio Member Join Date: Feb 2004 Location: Anonymityville	For a dual supply setup, the signal ground and 0v of the transformer go to "common". For a single supply setup the signal ground still goes to "common", but the "ground" of the supply connects to -Vcc and then you place a jumper where it says "LINK". You will also need to use a large capacitor in series with the output with a single supply. I don't see a space on the board for this so it will have to be mounted off board. The TDA2030 schematic uses a 2000uf capacitor for this. Oops, also the capacitor between -Vcc and ground won't be needed with a single supply. __________________ "If you don't like funerals don't kick sand in Ninja's face." - Ninja

19th October 2007, 06:38 PM	#9
jacco vermeulen diyAudio Member Join Date: Oct 2004 Location: At the sea front, just under Rotterdam	Puffy, this schematic resembles yours for a number of the parts : http://www.mitedu.freeserve.co.uk/Ci...Audio/tda8.htm (different of course : 47K=150K, 1.5K=4.7K) The BOM for the RS PCB : HERE __________________ Looks like Sponge Bob has killed another thread.

Thread Tools	Search this Thread
Show Printable Version Email this Page	Search this Thread: Advanced Search


	Please consider donating to help us continue to serve you. Ads on/off / Custom Title / More PMs / More album space / Advanced printing & mass image saving

17th October 2007, 08:09 PM	#2
Puffin diyAudio Member Join Date: Feb 2006 Location: U.K	Here is the board http://i73.photobucket.com/albums/i2.../Circuitbd.jpg

19th October 2007, 07:05 AM	#3
Puffin diyAudio Member Join Date: Feb 2006 Location: U.K	I take it I have stumped everyone. Oh well I'll see if I can get it working without blowing it up.

19th October 2007, 02:10 PM	#5
Puffin diyAudio Member Join Date: Feb 2006 Location: U.K	AndrewT. I don't have a schematic, but have some more pics which may be clearer. http://i73.photobucket.com/albums/i2...x/DSCF0350.jpg http://i73.photobucket.com/albums/i2...x/DSCF0351.jpg

19th October 2007, 05:29 PM	#7
Puffin diyAudio Member Join Date: Feb 2006 Location: U.K	Anonymous1. Thanks for that. I assume also that the ground for the output goes to common. Is there anything to be gained from using a dual rail supply ?

19th October 2007, 07:52 PM	#10
Puffin diyAudio Member Join Date: Feb 2006 Location: U.K	Thanks Anonymous1 and Jacco.

Currently Active Users Viewing This Thread: 1 (0 members and 1 guests)

Similar Threads
Thread	Thread Starter	Forum	Replies	Last Post
Freebird + Gainclone = "integrated" gainclone?	bikehorn	Chip Amps	9	5th January 2006 03:07 PM
JLH v Gainclone?	Jezz-the-Fezz	Solid State	5	12th December 2005 12:08 PM
Big gainclone	steven344	Chip Amps	10	23rd November 2005 07:58 PM

New To Site?	Need Help?
Register to Participate Search Privacy Statement Contact Us	Frequently Asked Questions Did you forget your password? Mark Forums Read