{"id":4234,"date":"2021-05-15T15:33:11","date_gmt":"2021-05-15T20:33:11","guid":{"rendered":"https:\/\/pugix.com\/synth\/?p=4234"},"modified":"2023-02-15T13:35:16","modified_gmt":"2023-02-15T18:35:16","slug":"tetrazzi-large-pcb","status":"publish","type":"post","link":"https:\/\/pugix.com\/synth\/tetrazzi-large-pcb\/","title":{"rendered":"Tetrazzi Large PCB"},"content":{"rendered":"\n
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The Large PCB<\/figcaption><\/figure>\n\n\n\n

This PC board appeared in my mailbox, a gift from Josh Rodriquez. It’s hard to believe that it has been nine years since my Modular Tetrazzi project<\/a> to put Peter Blasser’s SMT Tetrazzi board into a MOTM panel. This time the task is to analyze this large PCB. It helped to have an original Tetrazzi on hand to open up and probe around.<\/p>\n\n\n\n

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Original Tetrazzi with bars moved aside<\/figcaption><\/figure>\n\n\n\n

Fixing a problem with the etch at the piezo inputs<\/h3>\n\n\n\n

To get the piezo bars working a trace needs cutting and three jumpers added.<\/p>\n\n\n\n

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One of the four piezo inputs that all need fixing<\/figcaption><\/figure>\n\n\n\n

Next to a TL082 is found the oblong symbol with two connections. Make the following changes:<\/p>\n\n\n\n