{"title":"Solid State","description":"\u003cp\u003eSolid-state headphone amplification — the Associate DIY amplifier PCB and the HID headphone preamp by System Dump. Directly coupled designs, no glow required.\u003c\/p\u003e","products":[{"product_id":"associate-amplifier","title":"Associate Amplifier PCB","description":"\u003cp style=\"color: #ff2a00;\"\u003e\u003cstrong\u003eExternal 24V power supply required.\u003c\/strong\u003e\u003c\/p\u003e\n\u003ch4\u003eUnity gain follower\u003cbr\u003e150mA output\u003c\/h4\u003e\n\u003cp\u003eInspired by many, built by a few. The Associate amplifier is here. Build it yourself, hang it on a shelf!\u003c\/p\u003e\n\u003cp\u003eAvailable as PCB. For boutique versions, \u003ca href=\"https:\/\/discord.gg\/fAqPWhq7Af\" rel=\"noopener noreferrer\" target=\"_blank\"\u003eplease contact Parker through our Discord\u003c\/a\u003e.\u003c\/p\u003e\n\u003ch3\u003eBill of materials and guide\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e\u003ca href=\"https:\/\/www.digikey.com\/short\/rv8r2nz9\" rel=\"noopener noreferrer\" target=\"_blank\"\u003eDigiKey BOM (updated 4\/26)\u003c\/a\u003e\u003c\/li\u003e\n\u003cli\u003e\u003ca href=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0719\/5705\/3736\/files\/Associate_Amplifier_BOM_Index.pdf?v=1777856275\" rel=\"noopener noreferrer\" target=\"_blank\"\u003eParts index (PDF, updated 5\/3)\u003c\/a\u003e\u003c\/li\u003e\n\u003cli\u003e\u003ca href=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0719\/5705\/3736\/files\/Associate_Build_Guide_Updated.pdf?v=1777856280\" rel=\"noopener noreferrer\" target=\"_blank\"\u003eBuild guide (PDF, updated 5\/3)\u003c\/a\u003e\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003eCase\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e\n\u003ca href=\"https:\/\/www.amplifiedparts.com\/products\/chassis-box-hammond-extruded-aluminum-866-x-406-x-209\" rel=\"noopener noreferrer\" target=\"_blank\"\u003eRecommended case\u003c\/a\u003e — Hammond extruded aluminum\u003c\/li\u003e\n\u003cli\u003e\u003ca href=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0719\/5705\/3736\/files\/Associate_case.zip?v=1776146970\" rel=\"noopener noreferrer\" target=\"_blank\"\u003e3D printable case (ZIP)\u003c\/a\u003e\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003eVolume control\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e\u003ca href=\"https:\/\/partsconnexion.com\/alps-10k-blue-velvet-stereo-potentiometer\" rel=\"noopener noreferrer\" target=\"_blank\"\u003eAlps 10k Blue Velvet Stereo\u003c\/a\u003e\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003e\u003cspan style=\"text-decoration: underline;\"\u003e\u003ca href=\"https:\/\/etaheadphones.com\/blogs\/eta-tuning-and-design\/system-dump-engineering-associate-power-supply\"\u003eBlog post\u003c\/a\u003e\u003c\/span\u003e\u003c\/h3\u003e\n\u003ch2\u003ePower Supply\u003c\/h2\u003e\n\u003cp\u003e\u003ca href=\"https:\/\/www.amazon.com\/dp\/B00B88EGM6\"\u003eAmazon supply\u003c\/a\u003e — recommended off-the-shelf\u003c\/p\u003e\n\u003cp\u003e\u003ca href=\"https:\/\/www.antekinc.com\/50w-linear-power-supply\/\"\u003eDIY plug and play\u003c\/a\u003e — recommended DIY intermediate \u003c\/p\u003e\n\u003ch3\u003eDIY power supply parts - recommended\u003c\/h3\u003e\n\u003cul\u003e\n\u003cli\u003e\u003ca href=\"https:\/\/www.amplifiedparts.com\/products\/fuse-slow-blow-250v-3ag-025-x-125\"\u003eFuse\u003c\/a\u003e\u003c\/li\u003e\n\u003cli\u003e\u003ca href=\"https:\/\/www.amplifiedparts.com\/products\/fuse-holder-3ag-type-low-profile-knob-right-angle-spade-lug\"\u003eFuse holder\u003c\/a\u003e\u003c\/li\u003e\n\u003cli\u003eAC inlet\u003c\/li\u003e\n\u003cli\u003e\u003ca href=\"https:\/\/www.antekinc.com\/an-0210-25va-10v-transformer\/\"\u003eTransformer\u003c\/a\u003e\u003c\/li\u003e\n\u003cli\u003e\u003ca href=\"https:\/\/www.amplifiedparts.com\/products\/wire-20-awg-solid-core-lacquered-cloth-cover-600v?attr_color=brown\u0026amp;attr_length=50%20feet\"\u003eHookup wire\u003c\/a\u003e\u003c\/li\u003e\n\u003cli\u003e\u003ca href=\"https:\/\/www.digikey.com\/en\/mylists\/list\/65MVARP4OR\"\u003ePower supply BOM\u003c\/a\u003e\u003c\/li\u003e\n\u003c\/ul\u003e","brand":"System Dump","offers":[{"title":"Unity gain follower","offer_id":48785129898280,"sku":"PCB-1","price":25.0,"currency_code":"USD","in_stock":true},{"title":"Power supply","offer_id":51806832394536,"sku":"Power","price":25.0,"currency_code":"USD","in_stock":false},{"title":"Both","offer_id":51808290930984,"sku":"PCB-Both","price":45.0,"currency_code":"USD","in_stock":false}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0719\/5705\/3736\/files\/PXL_20231114_200732101.jpg?v=1719158726"},{"product_id":"hid","title":"HID - Headphone Preamp","description":"\u003cp style=\"font-size: 1.05em; line-height: 1.7; margin-bottom: 1.2em;\"\u003eHID is the Headphones Interface Device. A simple headphone amp \u0026amp; line stage with a fully directly coupled design. Keep it simple, stupid headphone output stage.\u003c\/p\u003e\n\u003cul style=\"line-height: 1.8; margin-bottom: 1.5em;\"\u003e\n\u003cli\u003eOPA2132 stock output device\u003c\/li\u003e\n\u003cli\u003e150 mW output power\u003c\/li\u003e\n\u003cli\u003eEIZZ 50KAX2 24-step attenuator\u003cbr\u003e\n\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch2\u003ePower Supply\u003cbr\u003e\n\u003c\/h2\u003e\n\u003cp\u003e\u003ca href=\"https:\/\/www.digikey.com\/short\/pf55bf52\"\u003ePower Supply Bom\u003c\/a\u003e\u003cbr\u003e\u003ca href=\"https:\/\/cdn.shopify.com\/s\/files\/1\/0719\/5705\/3736\/files\/Nerve.csv?v=1778557791\"\u003eBOM CSV\u003c\/a\u003e\u003c\/p\u003e","brand":"System Dump","offers":[{"title":"Default Title","offer_id":51501639565608,"sku":"HID-1","price":2000.0,"currency_code":"USD","in_stock":false}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0719\/5705\/3736\/files\/full.png?v=1780504869"}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0719\/5705\/3736\/collections\/PXL_20251217_024039499.jpg?v=1779339399","url":"https:\/\/etaheadphones.com\/collections\/solid-state.oembed","provider":"ETA Audio","version":"1.0","type":"link"}