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12-22-2003, 10:48 PM
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Headphoneus Supremus
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Join Date: Nov 2002
Location: Belgium (Brussels)
Posts: 3,605
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Tangent Easy Power Supply
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12-23-2003, 08:02 PM
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500+ Head-Fi'er
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Join Date: Dec 2003
Location: Lawrence, KS
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Dammit, Tangent! 
As if my pockets weren't empty enough from this PPA project I'm starting, now I have to go and order up the parts for the TEPS, too!
One thing though: I think you should change the name to 'Tangent Power Supply', that way we could do a report on it and it would be a TPS Report. 
-Jason
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12-23-2003, 09:58 PM
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Contributor  Headphoneus Supremus: Top Mall-Fi poster. The "T" in META42. Member of the Trade
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Join Date: Sep 2001
Location: Aztec, NM
Posts: 5,247
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Red Swingline stapler not required to assemble this SKU.
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12-23-2003, 10:55 PM
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1000+ Head-Fi'er
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Join Date: Sep 2003
Location: west chicago burbs
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LOL I love that movie!
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12-24-2003, 09:16 AM
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100+ Head-Fi'er
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Join Date: May 2003
Location: Singapore and Malaysia
Posts: 342
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Try not to ground on the secondary side of the power supply. In some cases where a few CD player are grounded will prove fatal.
For example, X brand CD player uses supply voltage of +-15V and grounded 0V.
The PPA 0V is half the voltage of TEPS (Tangent Easy Power Supply), for example 12V reference to ground.
A short circuit is innevitable.
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12-25-2003, 07:59 PM
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500+ Head-Fi'er
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Join Date: Nov 2001
Posts: 608
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Is it possible to use a LM337 in this design (with the appropriate part changes/polarity reversal/etc.) to make a negative regulated supply? I'm looking to build a +/-15V supply. Or am I better off using LT1085/1033 like the Welborne PS1?
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12-25-2003, 08:10 PM
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500+ Head-Fi'er
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Join Date: Oct 2002
Location: Singapore
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Quote:
Originally posted by davei
Is it possible to use a LM337 in this design (with the appropriate part changes/polarity reversal/etc.) to make a negative regulated supply? I'm looking to build a +/-15V supply. Or am I better off using LT1085/1033 like the Welborne PS1?
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You're better off using the older PS-1 boards for US$5/ piece & dropping LM317T/ 337T reg's in there.
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12-26-2003, 07:05 AM
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500+ Head-Fi'er
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Quote:
Originally posted by Dreamslacker
You're better off using the older PS-1 boards for US$5/ piece & dropping LM317T/ 337T reg's in there.
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Cost is not an issue for me. I'm looking for maximum performance from a relatively simple circuit (i.e. my last resort is buying Jung Super Regular PCBs from Old Colony).
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12-26-2003, 01:04 PM
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500+ Head-Fi'er
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Join Date: Oct 2002
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I'd rather go with the PS-1. The TEPS is not a dual-voltage circuit.
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12-26-2003, 03:05 PM
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Join Date: Jan 2003
Posts: 1,800
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Quote:
Originally posted by Dreamslacker
I'd rather go with the PS-1. The TEPS is not a dual-voltage circuit.
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the TEPS is designed for use with Tangents PCBs which are all single voltage designs so no need for a dual supply
g
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12-26-2003, 03:40 PM
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500+ Head-Fi'er
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Join Date: Oct 2002
Location: Singapore
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Quote:
Originally posted by guzzler
the TEPS is designed for use with Tangents PCBs which are all single voltage designs so no need for a dual supply
g
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Yeah.
He wants a +/-15v PSU.
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12-26-2003, 03:41 PM
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500+ Head-Fi'er
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Join Date: Nov 2001
Posts: 608
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Quote:
Originally posted by guzzler
the TEPS is designed for use with Tangents PCBs which are all single voltage designs so no need for a dual supply
g
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Yup, I know it's a single voltage supply, but I need a dual so I wanted to know if it would be easy to use the TEPS as a basis for a negative supply  I guess some experimentation is in order!
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12-26-2003, 04:19 PM
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Contributor Headphoneus Supremus: Top Mall-Fi poster. The "T" in META42. Member of the Trade
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Join Date: Sep 2001
Location: Aztec, NM
Posts: 5,247
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With any type of isolated supply, you can take two of them and connect V- on one to V+ on the other like you'd do with a pair of 9V batteries. Each half is a positive regulator, but since they're isolated, the voltages can float anywhere you need them to be; if you strap two of them together, the midpoint is "ground", and the other two rails are V+ and V-. It would work just fine, but the parts cost would be unnecessarily high; you save at least the cost of the second transformer and the board space it takes up if you make a true dual supply. The transformer I use in the TEPS is perfectly capable of driving a pair of regulator circuits if I chose to make it do so, but it I didn't.
And no, you can't go dropping an LM337 into an LM317 board position. The pinouts are different.
I'm tempted to go make a dual-voltage version of the TEPS, but I lack a negative regulator IC to test it with. I guess I could make it use two positive regulators. Does this mightily offend anyone?
EDIT: "Trouble with grammar have I, yes!" -- Yoda
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01-05-2004, 07:36 AM
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Head-Fi'er
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Join Date: Sep 2002
Posts: 69
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tangent: I just built a PPA, and since I already have an Elpac from my META42, I didn't get an extra one for the PPA, figuring I'd wait till you guys come up with a custom PPA power supply. But, I noticed that you remarked on a headwize thread:
Quote:
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With a PPA, there isn't enough residual noise to tell the difference between an Elpac and batteries with RMAA.
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So, if I'm not worried about charging batteries, does this mean there's no performance reason to use the custom or any other power supply over the Elpac?
Btw, the PPA sounds great so far. The bass is truly astounding. Thanks to the PPA team, and especially to tangent for all the wonderful documentation.
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01-05-2004, 02:52 PM
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Contributor Headphoneus Supremus: Top Mall-Fi poster. The "T" in META42. Member of the Trade
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Join Date: Sep 2001
Location: Aztec, NM
Posts: 5,247
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Quote:
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does this mean there's no performance reason to use the custom or any other power supply over the Elpac?
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No, it just means that RMAA is not the right tool for testing power supplies. It was in response to a request for noise graphs at the output of an amp, as opposed to the existing graphs of noise at the output of the power supply.
We're glad you enjoy it.
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