SuperTeddyReg - help needed in calculating values - diyAudio
 SuperTeddyReg - help needed in calculating values
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 16th February 2013, 12:15 AM #1 diyAudio Member   Join Date: Jan 2008 SuperTeddyReg - help needed in calculating values Hello to everyone, I am planning to build SuperTeddyReg power supply and I am kindly asking for your help in calculating values in order to obtain +12V output voltage: 1. What voltage on secondary winding of transformer should I have 2. What would be the value of resistors R8 and R8A? Thank you in advance for your kind asnwers.
 20th March 2013, 03:29 AM #2 diyAudio Member     Join Date: Jun 2004 Location: Northern Quebec SuperTeddyReg - calculating values Hi Willi, 1: Minimum 12 vac & max 15 vac 2: The value R8/R8a should be calculated to allow at least 2V dropout as described on the Teddy's site: The dropout on the second stage (Vdo) can be calculated using the following formula: Vdo = Vout / ((R7+R8)/R7) -1) Using 100K for R7 Vdo = 100 * Vout / R8 or R8 = 100 * Vout / Vdo For a dropout of 2.5V R8 = 40 * Vout Where R8 is in Kilo Ohm
 2nd November 2013, 04:35 PM #3 diyAudio Member   Join Date: Jan 2008 Thank you for your kind response and sorry for getting back so late. After successfully built one STR, here are the values of components for +12V DC output, provided that voltage on transformer secondary is 15V AC and cca 21V DC after rectifier: R1+ 47 R1- link R2 22 K R3 10 K R4 100 K R6 5K R7 100 K R7A 100 K R8 680 K R8A 680 K R11 3,3 K Q1 2SK363BL Q2 BC550 Q3 2SK363BL Q4 D44H11 Q5 BC550 Q6 2SK363BL Q7 D44H11 C1 100uF/35V C2 100uF/35V C3 22uF/35V C4 0,1uF/63V C5 10uF/35V C6 0,1uF/63V D1 LED D2 1N4148
 25th February 2014, 09:49 PM #4 diyAudio Member   Join Date: Feb 2014 Need help designing power supply with super teddy reg Hello Willi! I dropped across your post, because I was looking for a decent power supply for my new Furutech ADL Esprit (DC +15V, 800mA, from 220-240V) There are commercial offers out there, but they cost almost the same as the rest of this DAC. I already had a SupperTeddyReg - Power supply in the past, so my idea was, to build one myself this time. However, I am in an extreme beginner stage. I don't have the slightest idea on how to design and calculate the thing. I am of course able to buy the components and to solder... but that's about it. So in case it does not cause trouble, my question would be, if you would be able to provide me with some link, where I can find an easy how-to... Thanks in advance! Diego Last edited by diegoknipser; 25th February 2014 at 09:53 PM.
 19th March 2014, 07:01 PM #5 diyAudio Member   Join Date: Jan 2008 Hello Diego, you can order a built STR directly from the manufacturer according to the specs you desire (input and output voltages). For this, you will have to build the rectifier and filtering stage by yourself. You can also order just the bare PCB from Teddy Pardo who is very friendly and will gladly help you with calculating values for your power supply. In both cases, you need to specify the output voltage, as well as input voltage that comes into the regulator (usually the AC voltage on your transformer multiplied by 1,414).

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