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Messages - WormBoy

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How Do I? Beginner's Paradise. / Re: PT2399 Not Adding Delay
« on: June 14, 2018, 04:28:21 AM »
Hmm, it seems the PT2399 chip is not working as it should as there is sound going in but not out. The chip is getting 5V on pin 1, but one thing to check is that pin 3 and 4 are connected to ground. Next, I would check your soldering on the IC socket and on the components directly attached to the IC. Since you already swapped the chip to no avail, it seems you can rule out a faulty IC (unless you got both from the same suspect supplier).

I am certainly no specialist on these delays, so perhaps somebody else can come up with a better strategy for debugging.

How Do I? Beginner's Paradise. / Re: PT2399 Not Adding Delay
« on: May 31, 2018, 09:14:49 AM »
Why have you been listening to pin 8 and 9? Don't know what should be heard there ... Perhaps listen at pin 12 and 14, but I would first listen at pin 3 and 2 of the mix pot (if there is delay there, that will narrow the problem area down considerably). Pin 6 to ground sets delay time, and depends on where you set the delay pot (2k7 to 52k7, so 41k looks fine).

Tech Help - Etcher's Paradise / Re: MADBOX mixer splitter problem
« on: May 29, 2018, 04:33:38 AM »
Are you talking about the TH Custom project? For bass, you might want to increase the value of the 220n caps; that may cure the loss of (low) frequencies, but that does not explain the clipping you experience. Are you using an active instrument? If it puts out quite a hefty signal voltage it might send the ICs into overdrive. With a passive instrument (or volume on the bass turned down) there should be no clipping, and if there is, there's something wrong (I would then start by checking whether the reference voltage VR is indeed 4.5V.

If the ICs are clipping due to a high input signal voltage, you could try a higher supply voltage. Make sure you check the max. allowed voltage on the filter caps C9 and C10 (which sees half the supply voltage) and make sure you stay well below their specified max. voltage! Alternatively, you could try rail-to-rail opamps that clip a bit later (but you won't gain that much headroom that way, I guess).

... by ordering the USPS to screw the UPU's rules would be right up their alley.
The rest of world seems to be ignoring those rules anyway. Itís only the US screwing their own small businesses as far as I can tell.

... I feel pretty bad for folks who just want to order a board or two and end up having to pay an equal price in shipping.
And ordering 4-5 boards is not going to help. Then you hit an import threshold and have to pay VAT, clearing costs, etc. which will double the entire price again.

VFE Projects / Re: Triumvirate - purpose of the series EQs
« on: February 03, 2018, 01:11:25 PM »
They second order filters, which are steeper than the more common first order ones. So that should give a better separation between the different bands.

Open Discussion / Re: Helping Hands Soldering?
« on: January 26, 2018, 09:21:14 AM »
Plus, populating the board is the fun part. I'd rather find a way to speed up the other stuff.
Hihi, good to see that I am not the only one  ;D. Soldering slowly and methodically works like meditation for me.

For those of you outside the US, what kind of shipping rates do you typically pay for PCBs when ordering inside of Europe, Australia, etc.?
It is usually weight based, and it is not always clear whether you pay for handling as well. For PBCs/small kits from TH Customs (Germany), I (Netherlands) pay 2-4 Euro (2.45-4.90 USD). FuzzDog (UK) is more expensive with postage; around 3.75-4.50 pounds (5.20-6.30 USD) for 3-5 PCBs and sometimes some small parts. Unfortunately, a large fraction of the nice-PCB-projects-for-DIY-guitarists is located in the US ... Time to move the order processing to Canada or Mexico  ;D.

This change aligns with the Universal Postal Union(UPU) Integrated Product Plan (IPP) which will require that format P (letters) and format G (flats) may contain only documents, not goods.
Interesting ... that in this respect the US is apparently at the forefront of adhering to international agreements. In Europe, I have not encountered this rule yet. I regularly order components (incl. 3pdt switches and jacks) from Germany, and up to a several hundred grammes they arrive in a letter for about 3 Euro. If that stops, this will become a very expensive hobby indeed ...

Very interesting, this is the first I've heard that this change was made by the UPU.
I find that hard to believe as this affects US to rest of the world only. The rest of the world can still send PCBs around, across national boundaries, at reasonable rates.

Global Annoucements / Re: 2018 Shipping prices start today
« on: January 22, 2018, 02:55:35 AM »
Well, that's the end of buying from the US for me, I'm afraid. Time to dust off the old etching skills ...

General Questions / Re: Soft true bypass?
« on: January 16, 2018, 10:40:15 AM »
There was an MB board (the Softie), about to be released, but withdrawn again. You can read about it here: Other suppliers are offering relay bypass boards though. I personally like the clunky, dead-simple, low-current requiring 3PDTs though  8).

How Do I? Beginner's Paradise. / Re: SMPS Project?
« on: January 16, 2018, 04:52:31 AM »
Tube Town in Germany has a kit for a module that turns 12V into max. 220V @15mA: I built one of these, and it works, but I still need to build a pre-amp with it, so it is not tested by me in practice yet (not sure if that would be a real recommendation anyway  ;D).

Tech Help - Projects Page / Re: Simple Road Rage Question
« on: January 15, 2018, 01:59:50 AM »
Maybe they could get them for cheap ... or it is a protection against major fluctuations in the mains voltage ... or the circuit draws so much current that the voltage supplied by the wall wart sags ... I really donít know. However, as the entire circuit lives behind a voltage regulator, you only need to make sure that you supply the regulator with a constant high-enough voltage so that the regulator stays happy  8)

Tech Help - Projects Page / Re: Simple Road Rage Question
« on: January 14, 2018, 03:00:35 AM »
Center positive/negative only relates to the plug you use to power it, and nothing with the circuit itself. Positive/negative ground is more important, but this is a regular negative ground circuit. So you can just use one road rage to get you 18 or 24v. If you power it with 12v, make sure the voltage doubler chip can handle it, and make sure that the voltage rating for the caps (particularly C4) is high enough.

Oh, and check current consumption of the circuit. I guess you will have to use the LT1054 as you will need the extra current. Also, you may want to check the schematic for your version of the mistress: the input is regulated down to 12 or 15v anyway in the mistress, so feeding it with 18v (and thus powering the road rage with 9v) may be enough.

VFE Projects / Re: Alpha Dog Clipping
« on: January 13, 2018, 03:08:01 AM »
Noon would effectively take the diodes out of the circuit, they are never really really entirely out.

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