davve
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Everything posted by davve
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I will order them from mouser. But how to get lower mV´s on the transistors? Trimpots turned all the way down and have 130mV cold. Thanks
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Yes I am using OP27. I bought them from ebay, guess not the best source. I bought from a top rated seller. Logo on opamps are Texas Instruments Only difference between opa445 and op27 pins are Don´t know if it matters. opa445 pin 8 NC pin 5 offset trim op27 pin 8 Vos trim pin 5 5 NC And on my KSA5 the 500 ohms trimpots are turned all the way down (clicking) then i have 125mv cold. If i am gonna rise the voltage i need to be able to adjust the mv down even more... Voltage are 21.7 v with op27.
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Wich opa445 should i use? i have opa445AP and they wont work in my psu. I have tested two pairs of them, and psu is dead with them. Thanks
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Heatsink temps are around 50-60C, so it´s normal. Have question about the trimpots. Trimpots (500ohm) is turned all the way down (clicking) to get 105mv (hot) . Can´t get any lower mv, are they just for if you to run higher mv? Cause no need for adjustment then. Thanks
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Thanks for mention the 15024 and 15025, i had swapped them around. Now i have 21.8v + and 21.8v - stable voltage ? Amp is working great, and sounds good. Is it normal for the 15024 and 15025 to run very hot?
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Yes, and have changed the mpsa06 and mpsa56. Checked so every pin is correct. Don´t know what is wrong ?
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I have checked all the resistors. U3 and U4 have 3.5v between anode and chatode. And D1 and D2 have 12.9v across them.
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Thanks for the help. I have started up the PSU and i have 35V DC on the output. + - 70V DC together. Should be 21 + 21 -? All resistors are correct. RAW 35V DC is just over the rectifier? not on the output? If i understand correct?
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My apology then for using the krell thread. I have read the thread and was just wondering if there been some changes. Cause 10k or 1k input for the op27 is some diffrence. Perhaps i like to solder?
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I bought my kit from the link below, it is your version? But i was wondering, on the board it says 2x 10k ohms resistors and 2x 1k ohm resistors. But i got 4x 10k ohm resistors. https://www.ebay.com/itm/Power-supply-board-for-KG-version-KSA5-headphone-amp-PSU-DIY-kit-and-finished/122365758658?hash=item1c7d914cc2:m:mfcUM96JgKu8Wbo08L6PZFw
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I was wondering if it is okay to use 47pf or 100pf instead of the 33pf's. Thanks