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Electronics Forum (Circuits, Projects and Microcontrollers)

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Website title: Electronics Forum (Circuits, Projects and Microcontrollers)

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Message History

Convenient audio FFT module?

Hi - All I want is a module which has an audio input, say 10 address lines for the desired frequency, and an output which gives the level of that frequency. Everything I've found so far seems insanely complcated hardwarewise, softwarewise or both. Does anyone know of anything like this? (Or mght it be as well to use a narrowband filter somehow - though not so easy at audio frequ...


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Harman Kardon radio module BMW noise

Hello, My car speakers catch electric disturbance producing awful buzzing noise. When I put different radio module the noise disappears. I have now two modules for repair with different problems.One is picking up noise the other works fine but it looses radio stations and stops working when it wants. I am trying to repair the noisy module by comparing it to the working one but I...


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Integrating 0–5V ECU Signals into a Double-DIN Setup – Module vs Custom Head Unit?

I’ve been thinking about a cleaner way to display standalone ECU data (boost, AFR, oil pressure, flex fuel, etc.) in a double-DIN setup instead of running separate gauges or a tablet. It seems like there are two possible approaches: Option 1 – External Module + Android Head Unit Reads 0–5V signals and/or CAN Connects via USB to an Android head unit Custom app displays ...


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Pulse Detector Circuit, Thread No. 2

This original thread has a very interesting circuit at the bottom of the page: Pulse Detector Circuit (original thread) The original poster wanted a circuit that produced a constant high output while a pulse tra...


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Puzzled about a relay

I thought I understood a bit about relays. Can anyone tell me why a power supply circuit would be designed with a relay to control the mains voltage (ie 220VAC, 13A where I am) where the voltage that energizes the relay coil also uses the same 220VAC power rail? I thought the whole point of a relay was to use a low voltage to switch a high voltage on/off for isolation/safety. ...


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