BC560C for BC560B (with the amount of negative feedback in these amps this substitution shouldn't make too much difference)2N5089G for BC239CBC109 for BC309B
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Heya!
I'll post a super high res reveal-all version as soon as I can ;-) i only screen grabbed this so sorry it's missing details.
Currently I've only adjusted values by simulation but i will calculate their exact values as a logarithmic scale in the next version of the schematic.
I use Vishay-Dale 0.1% tolerance metal film low noise audio resistors for faders/attenuators etc. but you should also remember that standard 1% metal film resistors are still 1% accurate in a serial configuration both individually and as a whole since probabilities scale proportionally and not additively .
1% accurate is probably enough but since i require stereo tracking the closer the better.
Glad to see it's useful to some people!
I'll post the "fully working" spice files too as a learning exercise since you can probably gain a lot by checking it out - it contains a lot of helper script for analysis that I've developed over time.
cheers
There is an unloved makerbot cupcake in the corner next to the Up!. It will print calibration cubes but I haven't attempted anything more complex.
You could try bringing it in and comparing the notworking to R&D's notworking.
-A
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I've attached a schematic that should be easier to read (it's ginormous!), any questions just lemme know.I'll post the LTSpice files once I get my act together - we have people over for lunch today so the chicken in the oven takes priority!L
On 3 June 2012 10:43, Luke Emrose <evolution...@gmail.com> wrote:
This assumption is correct.
On Jun 3, 2012 10:13 AM, "kris" <kr...@sleepingplanet.com> wrote:
oOOO
I'd always assumed that every resistor is made the same way and then measured and those close to what they were supposed to be get painted and sold as high tolerance and those that are out by up to 5% are painted low tolerance.
On 3/06/2012 10:08 AM, Charles Horn wrote:Hi Luke,
Thanks for sharing, it's good seeing clear schematics along with knowing the design considerations that led to them -- it is educational :)
I was wondering how important are the tolerances on the resistors off the rotary switches? Obviously whatever they are they are the control will be repeatable, but do you need them to be super close in value to each other so each position is a very accurate increment? Unfortunately on the image I can't see the actual values due to the res, but I presume most (all?) are log scale values.
I have often thought that if really accurate tolerances were required you could just measure the specific resistance of each individual resistor and discard those outside your own tolerance... assuming, as I am, (never needed to or bothered to check for myself) that a 5% tolerance resistor could just happen to be within say 0.1% of its stated value. Anyway, speculation aside, I'd be interested to know how you factor the component tolerances into your designs of differing high-endedness :)
Cheers,
Charles.
On 2 June 2012 12:27, Luke Emrose <evolution...@gmail.com> wrote:
And here is v5.1.0 of the schematic - I'm almost done designing!The PCB layout however will be EPIC....
On this LTSpice schematic is the balancing transformer stage, the preamp stage, the high-pass filter, then a fader, then a fader buffer, then an eq, then an output driver.
On 2 June 2012 11:34, Luke Emrose <evolution...@gmail.com> wrote:
A LOT.Actually tbho, what I'm wondering more about is why you would limit it to 4m x 4m and who would need more than that....
On 2 June 2012 11:25, Gav <the.mechat...@gmail.com> wrote:
Nice writeup, Luke!
I'm pondering how much stuff I could fit on a 4m x 4m PCB...
On Fri, Jun 1, 2012 at 12:50 PM, Luke Emrose <evolution...@gmail.com> wrote:
Hi everyone!
I am currently undertaking another rather insane audio build, but this time I want to share the entire shebang with the list.
I've put every other build on hold for the moment as this one has shown itself to be the most important thing in my studio at the moment, as I'm suffering from a few recording issues that this is intended to solve.
I currently have been having issues recording my analog gear into my computer - and the issue is a combination of the level coming out of my analog synths being too low, or just not quite sounding right.So I've decided to build a front-end line amp and equalizer, which I've decided to base off of the Studer 169 mixer:
Because it's got a nice warm sound to it, and has an excellent line amplifier and very very music equalizer on it.I recently sold an old Yamaha mixer, and this will replace it for recording duties - keeping in line with my current 5-10 year plan of an entirely DIY studio from the ground up.
I managed to find the schematics from the Studer website: ftp://ftp.studer.ch/public/products/Mixing_Analog, and have now gone through the extremely complex process of refactoring the design to my purposes.
My modifications include the user of 12 position rotary switches for the boost/cut selections, and 6 position rotaries for the frequency selections on the EQ.I've also made some feature additions including multiple selections for the low frequency HP filter, including the choice between 6dB per octave and 12dB per octave slope selection.
Using rotaries rather than pots has one main advantage - perfect recall. I can write down the settings I use and then simply recreate them at any point, which I couldn't with a pot.Recall is quite important for me.
The next modification is modern transistor replacements, since the original circuit uses BC239C, BC560B, BC309B's. I'm going to likely have to go with whatever element14 has in stock, which means something like this set of substitutions:
BC560C for BC560B (with the amount of negative feedback in these amps this substitution shouldn't make too much difference)2N5089G for BC239CBC109 for BC309B
Also I managed to find the original Neutrik input transformers here:Which I've bought 4 each of, since I'm recreating the entire input stage for both the line and mic stages for 4 channels (2 x stereo), as I have 2 main synths I use.
I bought a 2u rack case from Altronics.
So, I'm gonna post the entire schematic and all the engineering drawing here for anyone interested within the next few days, including all the spice files.
It'll be fun ;-) but it'll take a while.
regards, hope someone finds this crazy journey useful also!
P.S. I just purchased the full 4m x 4m professional version of Eagle PCB so I can properly design the PCB's, which I've quite excited about.
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Luke Emrose
aka evolutionary theory
www.evolutionarytheory.com
www.soundcloud.com/evolutionarytheory
www.reverbnation.com/evolutionarytheory
http://www.facebook.com/pages/evolutionary-theory/110717958952413
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Luke Emrose
aka evolutionary theory
www.evolutionarytheory.com
www.soundcloud.com/evolutionarytheory
www.reverbnation.com/evolutionarytheory
http://www.facebook.com/pages/evolutionary-theory/110717958952413
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Luke Emrose
aka evolutionary theory
www.evolutionarytheory.com
www.soundcloud.com/evolutionarytheory
www.reverbnation.com/evolutionarytheory
http://www.facebook.com/pages/evolutionary-theory/110717958952413
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