API eq kits????

[Tillmann]

This is a pretty smooth little project. I'll be interested to see how it turns out.

T

 

[Guest]

[quote author="safe as milk"]hi
i live near brian sowter and want to ask him to knock me up


thankyou very much[/quote]
I thought you were down Southampton way?

 

[safe as milk]

yeah i am
brian lives in winchester, office/works is in ipswich

ive pm'd you

 

[gar381]

What happened to elco? His last post was June 9. I hope his
553 project is still alive!! :?:

GARY

 

[gar381]

BUMP

ELCO WHERE ARE YOU???? :?: :?:

GARY

 

[OneRoomStudio]

[quote author="Brad McGowan"]For those interested, it looks like Eisen Audio is going to be developing a simple 500-series high and low shelf EQ kit.

Brad[/quote]


Any news on this if the 553 project falls through?

 

[Bryson]

It'd be cool to fit a 312 and a 553 in one 500 module.

 

[gar381]

I am thinking about making a couple
of chan. strips of 312/553 that I can drop in
my Angela frame.

I am hoping this 553 project is not dead. :?


GARY

 

[peterc]

I've been toying with this for a while & came up with some freq switching mods. To save some money, I also used an opamp to unbalance the input but kept the classic output stage.

I have started a PCB layout, but it is still in development.

Let me know what y'all think.....

Peter

 

[flaheu]

Hey Peter,

I'm interested, I would like to have a simple EQ like that.

Keep us updated :thumb:

 

[Baltimore]

Couldn't we lose the inductor on the low band and have a shelving response? Then we could just switch out caps on the lows and highs without having to source the big inductor for the lows.

Also, JLM has pm2000 EQ mod kits. Kit includes board, inductors, resistors and caps. Two kits, one for low and one for high mid bands, from 115hz to 10k. The PM2k Eq section is the same topology as the 553, so the kits will work in the circuit. I was thinking of building a 4 band with high and low shelving and these kits for the mids. Something to think about. http://www.jlmaudio.com/JLM PM2000 EQ mod kit.htm


Kevin

 

[peterc]

Couldn't we lose the inductor on the low band and have a shelving response?

I thought about that, but it would be easy enough to put in a wire link to bypass the inductor. I'd like to keep fairly close to the original, although I know that was an unbalanced input.....

Good data at the JLM site, pity there is no 1H coil there... I'm going to start out by winding my own coils to see how they sound. I remember one of our members saying that the Toko 100mH coil did not sound good in this design (Peter Purpose??) so I'll wind that too. PP built this using gyrators & was happy with the result.

Food for thought.

Peter

 

[the scum]

Couldn't we lose the inductor on the low band and have a shelving response?

Only if you'd be happy with a high-shelf at ~100 Hz. If you want a low-shelf, you need to bypass the caps.

 

[12afael]

I´m a newbie on DOA , Peter´s schematics have a supply of 12,-14V is that correct? why?

anyway look like a great project Peter , keep us updated!

 

[matta]

I´m a newbie on DOA , Peter´s schematics have a supply of 12,-14V is that correct? why?

The 12 and 14 are the PIN OUT numbers, NOT the voltages. To the best of my knowledge the API racks use bi-polar 16V.

Cheers

Matt

 

[12afael]

thanx Matt

 

[peterc]

Teaser.... :wink:

Should have a proto in a couple of weeks.

 

[laitue5]

:shock:

 

[[silent:arts]]

:thumb:

 

[carloff]

amazing :thumb: