{"product_id":"pease-out","title":"Pease-out","description":"\u003cp\u003eA tribute to legendary analogue circuit designer Bob Pease. This soldering kit from Boldport is an LED flasher circuit built around the LM331 voltage-to-frequency converter chip.\u003c\/p\u003e\n\u003cp\u003e\u003ca href=\"https:\/\/en.wikipedia.org\/wiki\/Bob_Pease\" target=\"_blank\" rel=\"noopener noreferrer\"\u003eBob Pease\u003c\/a\u003e was an expert analogue designer who developed seminal circuits that are still with us today. The \u003ca href=\"https:\/\/www.boldport.com\/products\/pease-second-edition\/\"\u003efirst Boldport Club project\u003c\/a\u003e was another tribute to Pease\u003c\/p\u003e\n\u003cp\u003eThis version uses a circuit built around the \u003ca href=\"http:\/\/www.ti.com\/product\/LM331\/\" target=\"_blank\" rel=\"noopener noreferrer\"\u003eLM331\u003c\/a\u003e, also designed by Pease. It is a single voltage to frequency converter where the setting of the trimmer sets the output frequency that can be observed by the flashing LED. The frequency range using the multi-turn 2MΩ trimmer is about 3Hz to 300Hz.\u003c\/p\u003e\n\u003cp\u003eThe circuit itself appears in \u003cem\u003e\u003ca href=\"http:\/\/www.ti.com\/lit\/an\/snoa735b\/snoa735b.pdf\" target=\"_blank\" rel=\"noopener noreferrer\"\u003eApplication Report SNOA735B\u003c\/a\u003e, Figure 2\u003c\/em\u003e. One of the primary advantages of this arrangement is that the output isn’t affected (much) by the supply voltage. The Application Report details other advantages.\u003c\/p\u003e\n\u003cp\u003e\u003cstrong\u003eNote: requires through-hole soldering!\u003c\/strong\u003e\u003c\/p\u003e\n\u003cp\u003e\u003ca href=\"https:\/\/boldport.com\/shop\/pease-out\" target=\"_blank\" rel=\"noopener noreferrer\"\u003eClick here for the kit contents and assembly guide\u003c\/a\u003e\u003c\/p\u003e\n\u003cp\u003e\u003cem\u003ePease-out\u003c\/em\u003e was Project #32 of the Boldport Club.\u003c\/p\u003e","brand":"Boldport","offers":[{"title":"Default Title","offer_id":29443950379091,"sku":"BOLD032","price":17.95,"currency_code":"EUR","in_stock":false}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0174\/1800\/products\/peaseo-built-top.jpg?v=1565281350","url":"https:\/\/shop.pimoroni.com\/en-eu\/products\/pease-out","provider":"Pimoroni Ltd","version":"1.0","type":"link"}