Search found 8 matches

by scm6079
Thu Aug 14, 2003 12:48 am
Forum: General Discussion
Topic: Need a circuit
Replies: 10
Views: 3461

Re: Need a circuit

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...
by scm6079
Sun Aug 10, 2003 12:09 am
Forum: General Discussion
Topic: IRF 350
Replies: 9
Views: 1890

Re: IRF 350

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
by scm6079
Sat Aug 09, 2003 11:55 pm
Forum: General Discussion
Topic: JFET differences: GP vs. SW vs. VHF vs. UHF
Replies: 5
Views: 1306

Re: JFET differences: GP vs. SW vs. VHF vs. UHF

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...
by scm6079
Sat Aug 09, 2003 3:45 pm
Forum: General Discussion
Topic: JFET differences: GP vs. SW vs. VHF vs. UHF
Replies: 5
Views: 1306

JFET differences: GP vs. SW vs. VHF vs. UHF

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...
by scm6079
Sat Apr 12, 2003 9:36 am
Forum: General Discussion
Topic: DC to AC conversion... ?
Replies: 15
Views: 3919

Re: DC to AC conversion... ?

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...
by scm6079
Sun Apr 06, 2003 8:21 pm
Forum: General Discussion
Topic: DC to AC conversion... ?
Replies: 15
Views: 3919

Re: DC to AC conversion... ?

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...
by scm6079
Mon Mar 31, 2003 3:57 pm
Forum: General Discussion
Topic: DC to AC conversion... ?
Replies: 15
Views: 3919

Re: DC to AC conversion... ?

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 ...
by scm6079
Fri Mar 28, 2003 3:58 pm
Forum: General Discussion
Topic: DC to AC conversion... ?
Replies: 15
Views: 3919

DC to AC conversion... ?

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...