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How much power are you running through this 'switch'... is it line level? And are the switches SPST momentary, or DPDT momentary? You could always run a relay array with some basic logic to do a 'physical' type switch if it is speaker level power. <p>Also, what did you want to spend on it-- although...

Chances are reasonable that if it is an LCD or LED display, it is a standard unit, controlled via serial. I can't help with the EQ, but perhaps if you do a search for the display part number you can get the data sheet for the display, and independently test that component.<p>-Scott

Thanks for the great information, I'm understanding that allot more now. <p>In my case, I'm looking to use some external logic (running at 3.5vdc) to cotrol what is currently a very low voltage/current 'physical' switch.<p>I believe that JFET seems the most appropriate, since I don't have any curren...

Could someone help explain the difference between GP (general purpose) SW (switch?) VHF and UHF JFETs? <p>I am designing a circuit and using a JFET as a 'relay replacement' for a very small current flow. In picking the correct JFET for the job, I don't know the difference between these different ava...

I think that building the 9vac adapter would be the 'smarter' choice, since the transformer should isolate the circuit, and shouldn't create the high frequency 'whine' that comes with most dc-dc converters. <p>That said, in from the car battery is from 12v-15v depending on the alternator state. Know...

Okay-- I pulled the EQ apart... and was rather surprised by what I found. They have a diode built bridge rectifier -- and TWO voltage regulators -- a +12V and a -12V! Aack. After tracing their power circuit, it is clear that the chips inside use both the +12v and -12v lines. <p>Soo... The idea of fe...

Wow -- sincere thanks for the great responses. I'll 'crack the case' on the EQ and see what it has. I hadn't considered they may go through the effort to make a 9V AC wall adapter, and bridge it to DC internally... Hmm.. <p>If it turns out to not be flattened to DC, and I need to build the DC-to-AC ...

I am working on an automotive project, and find myself needing a 9V-AC supply line to power an existing component. I know I can regulate the 12V DC auto line to 9V DC with a power regulator, but I wasn't sure the best way to turn it to AC. <p>I was thinking about using a pair of 555 timers (or a 556...