{"product_id":"coppersound-substitution-box-transistor-422701","title":"Substitution Box Transistor","description":"\u003ch3\u003eA \"substitution box\" approach designed for audio electronics prototyping\u003c\/h3\u003e\u003cp\u003eA substitution box is a design tool that allows you to quickly compare values or types of components in a circuit while you listen and measure the result in real time. In the world of musical DIY (effect pedals, mods, small audio builds), this type of tool quickly becomes indispensable whenever a component influences output level, dynamics, noise, headroom, or tone. The \u003cstrong\u003eCoppersound Substitution Box Transistor\u003c\/strong\u003e focuses on one of the most critical choices for a circuit's character: the transistor.\u003c\/p\u003e\u003cp\u003eNote: the \"Substitution Box\" series is also available in other versions (resistors, film capacitors, ceramic capacitors, electrolytic capacitors, diodes), allowing you to maintain the same workflow logic across the entire prototyping chain, from fine-tuning a filter to selecting a clipping component.\u003c\/p\u003e\u003ch3\u003eWho is the Coppersound Substitution Box Transistor for, and when to use it?\u003c\/h3\u003e\u003cp\u003eThis substitution box is aimed at \u003cstrong\u003epedal designers\u003c\/strong\u003e, DIY enthusiasts, technicians, and anyone prototyping on breadboards (or wanting to validate a transistor choice before integrating it onto a PCB). It is particularly useful when you want to compare behaviors rather than just \"values\": sharper attack, smoother saturation, more pronounced gate, better stability, or even better-controlled background noise depending on the transistor type selected.\u003c\/p\u003e\u003cp\u003eIn practice, it saves you time on back-and-forths: instead of removing a transistor, bending leads, checking connections, and repeating, you switch from one option to another immediately. The result: you listen more, measure faster, and make more reliable decisions based on consistent tests.\u003c\/p\u003e\u003ch3\u003eKey features: compare transistors in real conditions without interrupting your session\u003c\/h3\u003e\u003cp\u003eThe \u003cstrong\u003eSubstitution Box Transistor\u003c\/strong\u003e is designed to make experimentation seamless: you connect the box to the circuit points to be tested, then select different transistor references to observe variations in gain, response, and behavior. This is a real advantage for circuits where component choice changes the playing feel, such as fuzz pedals, certain boosts, or sensitive input stages.\u003c\/p\u003e\u003ch4\u003eA selection focused on DIY audio\u003c\/h4\u003e\u003cp\u003eThis version includes several families of transistors commonly encountered in audio design: \u003cstrong\u003eBJT\u003c\/strong\u003e, \u003cstrong\u003eJFET\u003c\/strong\u003e, and \u003cstrong\u003eN-channel MOSFET\u003c\/strong\u003e. This allows you to compare different topologies and signatures and quickly identify what best serves your goal (transparency, coloration, compression, guitar volume response, etc.).\u003c\/p\u003e\u003ch4\u003eAssembled, so you can focus on sound and measurement\u003c\/h4\u003e\u003cp\u003eEach model is delivered \u003cstrong\u003efully assembled\u003c\/strong\u003e. This avoids wiring or assembly errors that often skew comparisons, letting you get straight to the point: testing, listening, measuring, iterating.\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)\"\u003eAmp Simulator\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:4;--wb-lb:transparent;--wb-rb:var(--wb-neutral-50)\"\u003e\u003ctd style=\"text-align:left\"\u003e\u003cstrong\u003eModel\u003c\/strong\u003e\u003c\/td\u003e\u003ctd style=\"text-align:left;font-weight:var(--font-body-weight-bolder)\"\u003eCoppersound Substitution Box Transistor\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:5;--wb-lb:var(--wb-neutral-50);--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\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:6;--wb-lb:transparent;--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\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\u003c\/table\u003e","brand":"CopperSound","offers":[{"title":"Default Title","offer_id":54358082617619,"sku":"422701","price":79.0,"currency_code":"EUR","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0984\/0872\/6803\/files\/a7a729881cf7596b81bf41a6a6e068d5fba8de41_FILLING_COPSBTR.jpg?v=1789360843","url":"https:\/\/woodbrass.shop\/products\/coppersound-substitution-box-transistor-422701","provider":"Woodbrass.com","version":"1.0","type":"link"}