Spencerleehorton

API-553 Build 3 band with switchable frequencies
« on: January 13, 2017, 02:44:00 AM »
Hi all,

Though I'd document my API-553 build, want to make my own pcbs, inductors and psu.
Want to check BOM is good and also talk about how to put in switchable frequencies for Low, mid and treble.
website: www.mohawkstudios.co.uk
email: [email protected]

If it hisses its probably the wrong impedance!!!
Or a snake!!!


Spencerleehorton

Re: API-553 Build 3 band with switchable frequencies
« Reply #1 on: January 13, 2017, 04:14:16 AM »
2x 27k
1x 1.3k
1x 1.8k
1x 680R
1x 3.9k
3x 10k
1x 47R

CR1 2161 - 1N4007
CR2 2161 - 1N4007
DS1 AL209 - LED
2x 100uf / 16v
1x 470uf / 16v
1x 500uf / 6v
1x 5uf / 16v

0.033uf
0.039uf
2x 180pf
3x 10k pots

2520 doa

100mh inductor
1H inductor
« Last Edit: January 19, 2017, 01:25:52 AM by Spencerleehorton »
website: www.mohawkstudios.co.uk
email: [email protected]

If it hisses its probably the wrong impedance!!!
Or a snake!!!

EmRR

Re: API-553 Build 3 band with switchable frequencies
« Reply #2 on: January 13, 2017, 08:49:23 AM »
Keep in mind if you want the shapes to stay the same, you need to also switch inductors.  May not matter. 
Best,

Doug Williams
Electromagnetic Radiation Recorders

"I think this can be better. Some kind of control that's intuitive, not complicated like a single knob" - Crusty

"Back when everything sounde

Spencerleehorton

Re: API-553 Build 3 band with switchable frequencies
« Reply #3 on: January 13, 2017, 12:14:34 PM »
Im populating boards and not exactly sure I've got all values correct if anyone could check please?
also if anyone could be specific in what i need to be able to switch frequencies.
also i would like a HPF and LPF if possible.
website: www.mohawkstudios.co.uk
email: [email protected]

If it hisses its probably the wrong impedance!!!
Or a snake!!!

Spencerleehorton

Re: API-553 Build 3 band with switchable frequencies
« Reply #4 on: January 13, 2017, 12:37:07 PM »
schematic im working from
website: www.mohawkstudios.co.uk
email: [email protected]

If it hisses its probably the wrong impedance!!!
Or a snake!!!

Spencerleehorton

Re: API-553 Build 3 band with switchable frequencies
« Reply #5 on: January 13, 2017, 12:38:00 PM »
this is what ive done with the layout, need it checked!!!

also ive put R14 in red as it doesnt seem to be included anywhere?

also what could i use to replace the 2161 Diodes and the AL209 diode?

Also is there a pot for the gain trim or is that just a link put in?
« Last Edit: January 13, 2017, 12:41:29 PM by Spencerleehorton »
website: www.mohawkstudios.co.uk
email: [email protected]

If it hisses its probably the wrong impedance!!!
Or a snake!!!

Spencerleehorton

Re: API-553 Build 3 band with switchable frequencies
« Reply #6 on: January 13, 2017, 12:43:21 PM »
Im wanting to put this within a Neve Pre Amp, which is my Xbox Neve project, if anyone could help me talk about connecting it please, as i think i can do it without the transformer being installed?
website: www.mohawkstudios.co.uk
email: [email protected]

If it hisses its probably the wrong impedance!!!
Or a snake!!!

iprovlek

Re: API-553 Build 3 band with switchable frequencies
« Reply #7 on: January 13, 2017, 12:46:10 PM »
Is this will be available for some etching Spence?


Spencerleehorton

Re: API-553 Build 3 band with switchable frequencies
« Reply #8 on: January 13, 2017, 12:48:26 PM »
Yes thats what i've done dude, i've etched my own and going to wind my own inductors!!
i'll post up the etch image as ive fattened up the tracks, just need to make sure the circuit works!!!
website: www.mohawkstudios.co.uk
email: [email protected]

If it hisses its probably the wrong impedance!!!
Or a snake!!!

iprovlek

Re: API-553 Build 3 band with switchable frequencies
« Reply #9 on: January 14, 2017, 10:02:50 AM »
Great Spence!

So your inductors will be for sale for this project!?


Spencerleehorton

Re: API-553 Build 3 band with switchable frequencies
« Reply #10 on: January 14, 2017, 11:25:04 AM »
Yes if there is enough interest I can make some available, any idea of what price you would think?
website: www.mohawkstudios.co.uk
email: [email protected]ohawkstudios.co.uk

If it hisses its probably the wrong impedance!!!
Or a snake!!!

iprovlek

Re: API-553 Build 3 band with switchable frequencies
« Reply #11 on: January 14, 2017, 12:35:48 PM »
I dont know!!!

Suggest a price Spence!!! You are the boss!!!

Spencerleehorton

Re: API-553 Build 3 band with switchable frequencies
« Reply #12 on: January 16, 2017, 02:33:48 AM »
Well at a guess how would £25 for the 100mh and £30 for the 1H sound?

Also I'm interested in this picture as I can see three way switches with caps on each side for selecting frequencies of each band, the question is what value caps to use?
website: www.mohawkstudios.co.uk
email: [email protected]

If it hisses its probably the wrong impedance!!!
Or a snake!!!

Spencerleehorton

Re: API-553 Build 3 band with switchable frequencies
« Reply #13 on: January 16, 2017, 02:45:35 AM »
I'm also happy to use lorlins to select frequencies, rather than switches.
website: www.mohawkstudios.co.uk
email: [email protected]

If it hisses its probably the wrong impedance!!!
Or a snake!!!

Spencerleehorton

Re: API-553 Build 3 band with switchable frequencies
« Reply #14 on: January 16, 2017, 09:04:25 AM »
Right i'm all wired up as per the 553 schematic, just waiting for the inductors to arrive and then i'll wind them.
Im installing these within a Neve 1290 preamp so just need to check exactly how i would connect as not going to use transformer, as already have transformer in Neve 1290 preamp.
Now to sort preamp and psu, need to regulate 24v to 15v with 7815 and have -15v from 7915 regulator, 24v feed to preamp and 48v for phantom.
could anyone suggest a way of selecting different frequencies on each band please?
website: www.mohawkstudios.co.uk
email: [email protected]

If it hisses its probably the wrong impedance!!!
Or a snake!!!

iprovlek

Re: API-553 Build 3 band with switchable frequencies
« Reply #15 on: January 16, 2017, 03:24:15 PM »
Spence maybe this can help you it is under the pic!!!

https://groupdiy.com/index.php?topic=36522.0


Eq looks great and Lorlin can be great instead pots!!!

Spencerleehorton

Re: API-553 Build 3 band with switchable frequencies
« Reply #16 on: January 16, 2017, 03:47:02 PM »
this i think, is more on the money:

MF

3Khz      2,7nF
2,5Khz   3,9nF
2Khz      6,3nF

LF

150Hz    1µF
220Hz    0,5µF

HF

10Khz    370pF
12Khz    300pF

website: www.mohawkstudios.co.uk
email: [email protected]

If it hisses its probably the wrong impedance!!!
Or a snake!!!

Spencerleehorton

Re: API-553 Build 3 band with switchable frequencies
« Reply #17 on: January 16, 2017, 04:03:17 PM »
found this, which gives me a better idea.
website: www.mohawkstudios.co.uk
email: [email protected]

If it hisses its probably the wrong impedance!!!
Or a snake!!!

Whoops

Re: API-553 Build 3 band with switchable frequencies
« Reply #18 on: January 16, 2017, 10:30:55 PM »
The 550B has switchable frequencies,
check if the schematic is useful to you


Whoops

Re: API-553 Build 3 band with switchable frequencies
« Reply #19 on: January 16, 2017, 10:31:43 PM »
.