Amptweaker - Tight Metal  [traced]

General documentation, gut shot, schematic links, ongoing circuit tracing, deep thoughts ... all about boutique stompboxes.
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bajaman
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Post by bajaman »

polite suggestion - just redraw my last schematic with the correct layout and values - posting your schematic with all it's errors just confuses people. :secret:
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Post by apollomusicservice »

At bridged T-notch filter where is the place for C15-R22 at the point R20-R21 or C14-R21-C16? :hmmm:

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Post by euronymous0001 »

:slap:

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Post by bajaman »

At bridged T-notch filter where is the place for C15-R22 at the point R20-R21 or C14-R21-C16? :hmmm:
looking at the board again it certainly looks like it is connected at the R20-R21 point :oops:
If so my apologies - I will post an amended schematic unless euronymous0001 does so first - sorry. :slap:
Perhaps Jim could confirm this first.
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Post by J0K3RX »

bajaman wrote:At bridged T-notch filter where is the place for C15-R22 at the point R20-R21 or C14-R21-C16? :hmmm:
looking at the board again it certainly looks like it is connected at the R20-R21 point :oops:
If so my apologies - I will post an amended schematic unless euronymous0001 does so first - sorry. :slap:
Perhaps Jim could confirm this first.
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I will confirm as soon as I get home from work today :wink:

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Post by jymaze »

It is at the junction of R20 and R21! I even rechecked the pictures to be 300% sure... I was only 100% sure. :wink:

Anyway, if it were anywhere else but there it would not be called a T-filter, right... :slap:

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Post by bajaman »

TM schem 3d.png
hopefully correct value parts and configuration now :slap:
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Post by apollomusicservice »

apollomusicservice wrote:This is a new version with implemented corrections. Points 1-5 are connected to ground, IN-input, OUT-output, IN1 and OUT1 to insert out, the T1 Tight pot, G1 and G2 to gain pot, G3 and G4 to gain pot other sections (both at Gate SW also), TO1 TO2 TO3 on Tone pot, TH on Thrash sw, V1 V2 V3 the Volume pot and
+9 V power supply. :)
OK guys backing your changes I've made a small correction to the PCB. I am convinced that this is the final version :D
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TightMetal SMD v1.4.pdf
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TightMetal SMD v1.4 components+layer.png
TightMetal SMD v1.4 components.png
TightMetal SMD v1.4 components.png (7.49 KiB) Viewed 2416 times

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The G
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Post by The G »

Great effort, dudes!

Can anybody enlighten me as to what purpose the lonely diodes between the IC1A and IC2A inputs serve? Are they really 1N4148, Jim? The pictures are too blurry to see anything clearly.

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Post by jymaze »

In clipping situation, the inputs can get away from each other as you are no more in linear situation. So the diode across the inputs of IC2A clips the signal. However, the diode across the inputs of the buffer is a mystery as it is totally linear...

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Post by The G »

But it's only one diode, so the clipping is one sided. Does James Brown know something about TL072 that we don't?
Of course, it would be not the first time parts with no real function are found in pedals.
One way or another, I'll try to squeeze some time from this weekend to breadboard TM.

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Post by bajaman »

Here are some photoview files for the enclosed Sprint Layout V6.0 zip file (just rename the extension to .lay6 to open the file in Sprint :wink: ) Also included is the updated Eagle schematic. i have changed all the components to standard types - 475k becomes 470k etc.
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Tight Metal sized.zip
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Tight Metal Top side X ray photo view.BMP
Tight Metal Top side X ray photo view.BMP (1.73 MiB) Viewed 2371 times
Tight Metal top side parts layout photoview.BMP
Tight Metal top side parts layout photoview.BMP (1.73 MiB) Viewed 2371 times
Tight Metal bottom side parts layout photo view.BMP
Tight Metal bottom side parts layout photo view.BMP (1.73 MiB) Viewed 2371 times
tight metal -3e.sch
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TM schem 3e.png
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Post by jymaze »

Awesome, now maybe it is time for a fab run at OSH park?

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Post by bajaman »

Awesome, now maybe it is time for a fab run at OSH park?
Good idea - count me in for one board :wink:
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Post by J0K3RX »

jymaze wrote:Awesome, now maybe it is time for a fab run at OSH park?
+1

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Post by pakrat »

Excellent work guys! It's been exciting and impressive to see this unfold. I would definitely be interested in a board if there's a run :mrgreen:

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Post by J0K3RX »

What do you think about a TL074 and one TL072?

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Post by bajaman »

Freestompboxes Firm Steel Gerber and Drill data.rar
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Here are the Gerber and Drill data files :wink:
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Post by bajaman »

I have been agonising over the 4 red leds and the type of socket used to connect the dc power supply - according to the designer of the pedal these lights only operate when using the power supply NOT when the battery is connected. obviously the 4 leds will drain the battery very quickly as stated current consumption is only 12mA in battery mode and twice this current when using a 9v dc power supply. He must be using a stereo mini jack socket to enable this type of operation. My layout files use a more standard 2.1mm dc socket which merely isolates the +9v dc battery connection when a power supply is plugged in. If anyone is planning on building this and is intent on using battery power it would probably be wise to omit these four red leds from their build. :wink:
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Post by bajaman »

Re: Amptweaker - Tight Metal v8
Re: Amptweaker - Tight Metal v8
tight metal -3f.sch
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slight update to schematic - tight pot is now wired the right way around :wink:
tight and gain pots now wired as on the pcb
general tidy up :)
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bajaman
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