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The item may have some signs of cosmetic wear, but is fully operational and functions as intended. This item may be a floor model or an item that has been returned to the seller after a period of use. See the sellers listing for full details and description of any imperfections. We may receive commission if your application for credit is successful. User Agreement, Privacy, Cookies and AdChoice Norton Secured - powered by Verisign. These values are sufficient to reduce hum to inaudible levels and I recommend against going higher. You can also tune the sound quality and sound signature by using different opamps (yes, it does make a difference). Balanced Version Pga2311 Preamp Board Volume Controller Instructions Windows 7 Balanced VersionBalanced Version Pga2311 Preamp Board Volume Controller Instructions For Windows 7 Balanced Version Pga2311 Preamp Board Volume Controller Instructions For Computer Balanced Version Pga2311 Preamp Board Volume Controller Instructions 2017 How big are the boards Boards measure 1.975x1.75 (app. Itead or several other companies. What is the status of the boards This board is in version 1.1. I have previously prototyped version 1.0 which had a slightly different layout and only one input capacitor footprint, otherwise they are electrically identical. At the time of posting this I have ordered prototypes of v1.1 for myself but they havent arrived yet. At least not unless you go completely overboard with your choice of opamps Anything else I need to know You can omit the input caps (bridge them) if you are using a source that does not have DC offset. This board is not compatible with the ASX-modules when running in bridge mode because both opamps operate in phase. You cant power the board directly from the AUX supply on the ASX-module because the voltage is too high and the supply is unregulated. Use an external regulated supply or read the ICEpower docs for instructions on how to use the AUX supply. Balanced Version Pga2311 Preamp Board Volume Controller Instructions Download Design FilesDownloads: Download design files here Related information: See the links referenced in the original blogpost. Note: Always read the intro post for additional important information about my designs. I have lately found that there is a lot of interest in tone control circuits. Its beginning to seem as if 23 of the earths surface is covered by water and the remaining 13 is covered with diagrams of tone controls. Although I have covered this topic under the heading of Audio Amplifiers, How they Work the circuits on that page are not intended to be duplicated by the reader and there is virtually no information on how and where to insert them into an amplifier. Before we get to the tone controls themselves a question arises how to power the electronics in a tone control circuit I often receive emailed questions on this subject. I have concluded that it is advisable to include a power supply schematic on this page. There are alternatives to building a standalone power supply. The current required is small ranging from 1 mA for the least to 7 mA for the maximum at a voltage of 250 volts DC. A few power amplifiers have auxiliary power sockets for just this purpose. The circuits are specified to need 250 volts but they can operate anywhere from 200 to 350 volts and in some cases they will do just fine on 150 volts. Note: Remember this when looking for a transformer for one of the circuits below.) Failing an auxiliary power socket you can also go into a power amplifier or preamplifier and steel a small amount of power. Because power amplifiers have power to spare you are not very likely to cause an overload by obtaining power from this source. This may not be true for a preamplifier which itself may not need very much power. In any case you should not try this unless you know what you are doing. In any case you have decided to build a power supply for the tone control circuit. If your transformer comes with a center tap on the 6.3 volt secondary you may omit the two 100 ohm resistors and connect the center tap to the minus H V.
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