About pavelpick

March 4, 2016
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  • A Preamplifier for Smartphone Oscilloscopes

    I think it helped. But it is also possible that there was some soldering or other technical problem on the pcb bringing higher voltage to the phone. You ware soooo right that making the circuit on the pcb can couse a lot of troubles. And I really spent so long time to find all the mistakes. A good lesson to me.But now is the device in the box and I hope it will help me with my future project. Thanks for your patient replies for our questions.

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  • A Preamplifier for Smartphone Oscilloscopes

    Hello, really thanks for this simple and useful project. My question: the circuit works it shows waves correctly but after some time (and sometime almost immediately) it starts dialing the last phone number. It happens so often that I can not use it. Sometime it´s necessary to restart the phone, because it tends to dial the number even after the preamp is disconnected.I have HTC 601 phone. Does anybody have such problem? Any idea what to do? But anyway, thank you a lot, if even it will not work perfectly I got a lot of important knowledges.

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