Electro Tech is an online community (with over 170,000 members) who enjoy talking about and building electronic circuits, projects and gadgets. To participate you need to register. Registration is free. Click here to register now.
Welcome to our site! Electro Tech is an online community (with over 170,000 members) who enjoy talking about and building electronic circuits, projects and gadgets. To participate you need to register. Registration is free. Click here to register now.
Do you mean my Sound Level Indicator project as the original one? It has two extra transistors with one being used as an automatic level control to give an extra 20dB range for loud sounds. The Rhi DC reference level is increased 10 times (20dB) for loud sounds.
Then the total range is 50dB. To display a pin dropped on the floor in the next room to loud music played on the nearby stereo or my dog barking.
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