{"product_id":"coppersound-substitution-box-fets-422698","title":"Substitution Box FETs","description":"\u003ch3\u003eA Modern Approach to Prototyping: The Substitution Box Serving Designers\u003c\/h3\u003e\u003cp\u003eIn DIY electronics, especially in audio, a small change in value can transform a filter, gain, dynamics, or saturation texture. The CopperSound Substitution Box fits this rapid experimentation logic: instead of constantly removing and replacing components on a breadboard, you switch from one value to another in seconds. It's a simple and effective way to validate an idea, fine-tune a setting, or compare design options with a much more comfortable listening continuity.\u003c\/p\u003e\u003ch3\u003eWho Is the CopperSound Substitution Box FETs For?\u003c\/h3\u003e\u003cp\u003eThis substitution box is aimed at pedal builders, DIY enthusiasts, students, and technicians who want to save time during testing phases. It is especially useful if you work on input stages, buffers, switching sections, or circuits where the choice of transistor (JFET or MOSFET) directly influences the response and behavior of the setup. Whether you are prototyping on a breadboard or validating before PCB integration, the goal remains the same: iterate faster and decide with your ears and measurements rather than repetitive handling.\u003c\/p\u003e\u003ch3\u003eOperation and Highlights for Your Tests (JFET, MOSFET, and More)\u003c\/h3\u003e\u003ch4\u003eChange Components Without Interrupting Your Testing Flow\u003c\/h4\u003e\u003cp\u003eThe principle is simple: you connect the Substitution Box to the points in your circuit where you want to replace a component, then select another value or type according to the model. This method avoids errors related to repeated handling (damaged leads, poor contacts, swapped components) and allows you to maintain a clear comparative approach, step by step.\u003c\/p\u003e\u003ch4\u003eA Tool Focused on Listening, Measurement, and Decision Making\u003c\/h4\u003e\u003cp\u003eIn audio DIY, multiple options are often compared before fixing a value: adjusting filtering, controlling gain range, choosing a diode reference, or determining clipping behavior. The CopperSound Substitution Box facilitates this A\/B work: you keep the same circuit, the same power supply, the same test chain, and only vary the targeted component. Result: faster and more consistent choices, both on the oscilloscope and by ear.\u003c\/p\u003e\u003ch4\u003eAssembled and Ready to Integrate into Your Prototyping Setup\u003c\/h4\u003e\u003cp\u003eEach model is supplied fully assembled, allowing immediate integration into your workstation. This is a real advantage if you want to focus on circuit design rather than tool preparation.\u003c\/p\u003e\n\n\u003ch2\u003eTechnical specifications\u003c\/h2\u003e\n\u003cstyle\u003e@media(max-width:632px){table[data-wb-spec]{display:grid;grid-template-columns:minmax(0,1fr) minmax(0,1fr)}table[data-wb-spec] colgroup{display:none}table[data-wb-spec] tbody,table[data-wb-spec] tr{display:contents}table[data-wb-spec] td{display:block;overflow-wrap:anywhere;grid-row:var(--wb-l);background-color:var(--wb-lb)}table[data-wb-spec] td[data-r]{grid-row:var(--wb-r);background-color:var(--wb-rb)}table[data-wb-spec] td[colspan=\"2\"]{grid-column:1\/-1}table[data-wb-spec] td:empty{display:none}}\u003c\/style\u003e\n\u003ctable data-wb-spec style=\"width:100%;table-layout:fixed\"\u003e\n\u003ccolgroup\u003e\u003ccol style=\"width:25%\"\u003e\u003ccol style=\"width:25%\"\u003e\u003ccol style=\"width:25%\"\u003e\u003ccol style=\"width:25%\"\u003e\u003c\/colgroup\u003e\n  \u003ctr style=\"background-color:var(--wb-neutral-50);--wb-l:1;--wb-r:3;--wb-lb:var(--wb-neutral-50);--wb-rb:var(--wb-neutral-50)\"\u003e\u003ctd style=\"text-align:left\"\u003e\u003cstrong\u003eEffects\u003c\/strong\u003e\u003c\/td\u003e\u003ctd style=\"text-align:left;font-weight:var(--font-body-weight-bolder)\"\u003eBuffer\u003c\/td\u003e\u003ctd data-r style=\"text-align:left\"\u003e\u003cstrong\u003eColor\u003c\/strong\u003e\u003c\/td\u003e\u003ctd data-r style=\"text-align:left;font-weight:var(--font-body-weight-bolder)\"\u003eBlack\u003c\/td\u003e\u003c\/tr\u003e\n  \u003ctr style=\"background-color:transparent;--wb-l:2;--wb-r:4;--wb-lb:transparent;--wb-rb:transparent\"\u003e\u003ctd style=\"text-align:left\"\u003e\u003cstrong\u003eUse\u003c\/strong\u003e\u003c\/td\u003e\u003ctd style=\"text-align:left;font-weight:var(--font-body-weight-bolder)\"\u003eelectric guitar\u003c\/td\u003e\u003ctd data-r colspan=\"2\"\u003e\u003c\/td\u003e\u003c\/tr\u003e\n\u003c\/table\u003e\n\u003ctable data-wb-spec style=\"width:100%;table-layout:fixed\"\u003e\n\u003ccolgroup\u003e\u003ccol style=\"width:25%\"\u003e\u003ccol style=\"width:25%\"\u003e\u003ccol style=\"width:25%\"\u003e\u003ccol style=\"width:25%\"\u003e\u003c\/colgroup\u003e\n  \u003ctr style=\"background-color:var(--wb-neutral-50);--wb-l:1;--wb-r:7;--wb-lb:transparent;--wb-rb:transparent\"\u003e\u003ctd style=\"text-align:left\"\u003e\u003cstrong\u003eType\u003c\/strong\u003e\u003c\/td\u003e\u003ctd style=\"text-align:left;font-weight:var(--font-body-weight-bolder)\"\u003eDIY substitution box\u003c\/td\u003e\u003ctd data-r style=\"text-align:left\"\u003e\u003cstrong\u003eDiodes\u003c\/strong\u003e\u003c\/td\u003e\u003ctd data-r style=\"text-align:left;font-weight:var(--font-body-weight-bolder)\"\u003e24 pairs of diodes (small signal, zener, Schottky, MOSFET, and germanium)\u003c\/td\u003e\u003c\/tr\u003e\n  \u003ctr style=\"background-color:transparent;--wb-l:2;--wb-r:8;--wb-lb:var(--wb-neutral-50);--wb-rb:var(--wb-neutral-50)\"\u003e\u003ctd style=\"text-align:left\"\u003e\u003cstrong\u003eUsage\u003c\/strong\u003e\u003c\/td\u003e\u003ctd style=\"text-align:left;font-weight:var(--font-body-weight-bolder)\"\u003ereal-time quick selection of component values for prototyping\u003c\/td\u003e\u003ctd data-r style=\"text-align:left\"\u003e\u003cstrong\u003eCeramic capacitors\u003c\/strong\u003e\u003c\/td\u003e\u003ctd data-r style=\"text-align:left;font-weight:var(--font-body-weight-bolder)\"\u003e24 values, from 1 pF to 820 pF (50 V)\u003c\/td\u003e\u003c\/tr\u003e\n  \u003ctr style=\"background-color:var(--wb-neutral-50);--wb-l:3;--wb-r:9;--wb-lb:transparent;--wb-rb:transparent\"\u003e\u003ctd style=\"text-align:left\"\u003e\u003cstrong\u003eImplementation\u003c\/strong\u003e\u003c\/td\u003e\u003ctd style=\"text-align:left;font-weight:var(--font-body-weight-bolder)\"\u003ewire insertion at desired points (breadboard)\u003c\/td\u003e\u003ctd data-r style=\"text-align:left\"\u003e\u003cstrong\u003eElectrolytic capacitors\u003c\/strong\u003e\u003c\/td\u003e\u003ctd data-r style=\"text-align:left;font-weight:var(--font-body-weight-bolder)\"\u003e24 values, from 1 uF to 470 uF (25 V)\u003c\/td\u003e\u003c\/tr\u003e\n  \u003ctr style=\"background-color:transparent;--wb-l:4;--wb-r:10;--wb-lb:var(--wb-neutral-50);--wb-rb:var(--wb-neutral-50)\"\u003e\u003ctd style=\"text-align:left\"\u003e\u003cstrong\u003eDelivery condition\u003c\/strong\u003e\u003c\/td\u003e\u003ctd style=\"text-align:left;font-weight:var(--font-body-weight-bolder)\"\u003efully assembled\u003c\/td\u003e\u003ctd data-r style=\"text-align:left\"\u003e\u003cstrong\u003eTransistors\u003c\/strong\u003e\u003c\/td\u003e\u003ctd data-r style=\"text-align:left;font-weight:var(--font-body-weight-bolder)\"\u003e12 different NPN BJTs\u003c\/td\u003e\u003c\/tr\u003e\n  \u003ctr style=\"background-color:var(--wb-neutral-50);--wb-l:5;--wb-r:11;--wb-lb:transparent;--wb-rb:transparent\"\u003e\u003ctd style=\"text-align:left\"\u003e\u003cstrong\u003eResistors\u003c\/strong\u003e\u003c\/td\u003e\u003ctd style=\"text-align:left;font-weight:var(--font-body-weight-bolder)\"\u003e24 values, from 10 Ohms to 1 MOhm (1\/4 W)\u003c\/td\u003e\u003ctd data-r style=\"text-align:left\"\u003e\u003cstrong\u003eFETs\u003c\/strong\u003e\u003c\/td\u003e\u003ctd data-r style=\"text-align:left;font-weight:var(--font-body-weight-bolder)\"\u003e6 N-channel JFETs\u003c\/td\u003e\u003c\/tr\u003e\n  \u003ctr style=\"background-color:transparent;--wb-l:6;--wb-r:12;--wb-lb:var(--wb-neutral-50);--wb-rb:var(--wb-neutral-50)\"\u003e\u003ctd style=\"text-align:left\"\u003e\u003cstrong\u003eFilm capacitors\u003c\/strong\u003e\u003c\/td\u003e\u003ctd style=\"text-align:left;font-weight:var(--font-body-weight-bolder)\"\u003e24 values, from 1 nF to 1 uF (63 V)\u003c\/td\u003e\u003ctd data-r style=\"text-align:left\"\u003e\u003cstrong\u003eMOSFETs\u003c\/strong\u003e\u003c\/td\u003e\u003ctd data-r style=\"text-align:left;font-weight:var(--font-body-weight-bolder)\"\u003e6 N-channel MOSFETs\u003c\/td\u003e\u003c\/tr\u003e\n\u003c\/table\u003e","brand":"CopperSound","offers":[{"title":"Default Title","offer_id":54357516321043,"sku":"422698","price":79.0,"currency_code":"EUR","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0984\/0872\/6803\/files\/bfaed09a3d990889d7c41e2ceddd7dbabd44d624_FILLING_COPSBFE.jpg?v=1789352371","url":"https:\/\/woodbrass.shop\/products\/coppersound-substitution-box-fets-422698","provider":"Woodbrass.com","version":"1.0","type":"link"}