Need help on EQ circuit

Buzzy · 25th September 2007, 09:29 AM

Hi ! i would like to build the eight band sub eq from here http://sound.westhost.com/project84.htm
Right now i am sourcing for parts. May i know what type of resistors i should buy ? I am also confused on what capacitors C29, C38 and C39 are ? Can they be aluminium electrolytic ?

The power supply for this http://sound.westhost.com/project05.htm
recommends i use wall warts. However i would like to use a transformer. May i know how to connect the transformer to this circuit instead of the wall wart ?

theAnonymous1 · 25th September 2007, 01:25 PM

Quote:

Originally posted by Buzzy
May i know what type of resistors i should buy ?

1% metal film will be fine.

Quote:

Originally posted by Buzzy
I am also confused on what capacitors C29, C38 and C39 are ? Can they be aluminium electrolytic ?

They are DC blocking/AC coupling capacitors. Aluminum electrolytic will work, but film type are preferred.

Quote:

Originally posted by Buzzy
The power supply for this http://sound.westhost.com/project05.htm
recommends i use wall warts. However i would like to use a transformer. May i know how to connect the transformer to this circuit instead of the wall wart ?

That all depends on the transformer. Does it have single or dual secondaries? If it has dual secondaries and the voltage is appropriate, I would use an external bridge rectifier and leave D1, D2, D4 and D6 out of the circuit.

Buzzy · 25th September 2007, 02:22 PM

Thankz theAnonymous1. I have bought the resistors and the other parts. I found a transformer which is 15-0-15 10VA and a wall wart for about the same price. Which should i go for ? Btw i have trouble finding the LM7815 and LM7915. If i were to omit these will it explode ?

theAnonymous1 · 25th September 2007, 02:52 PM

Quote:

Originally posted by Buzzy
Thankz theAnonymous1. I have bought the resistors and the other parts. I found a transformer which is 15-0-15 10VA and a wall wart for about the same price. Which should i go for ? Btw i have trouble finding the LM7815 and LM7915. If i were to omit these will it explode ?

The LM7815 and LM7915 are the voltage regulators. These are the heart of the circuit and building it would be pointless without them.

I WOULD say get the 15-0-15 transformer and a bridge recitifier, but if your not even familiar with what a voltage regulator is/does , then I suggest you stick to the original circuit and parts..

25th September 2007, 09:29 AM	#1
Buzzy diyAudio Member Join Date: Apr 2007	Need help on EQ circuit Hi ! i would like to build the eight band sub eq from here http://sound.westhost.com/project84.htm Right now i am sourcing for parts. May i know what type of resistors i should buy ? I am also confused on what capacitors C29, C38 and C39 are ? Can they be aluminium electrolytic ? The power supply for this http://sound.westhost.com/project05.htm recommends i use wall warts. However i would like to use a transformer. May i know how to connect the transformer to this circuit instead of the wall wart ?

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25th September 2007, 02:22 PM	#3
Buzzy diyAudio Member Join Date: Apr 2007	Thankz theAnonymous1. I have bought the resistors and the other parts. I found a transformer which is 15-0-15 10VA and a wall wart for about the same price. Which should i go for ? Btw i have trouble finding the LM7815 and LM7915. If i were to omit these will it explode ?