I have been plotting to build an amp for a while, and have been stalking these forums while I do. Today I started ordering parts to build the basic amp camp board, just so I have a place to get started. Coincidentally, I ran across some old audio amps at work while searching for something else entirely, so I decided to try plugging them in and playing around. I didn't get very far, though, as this board has a connection I don't understand. It has all the connections I would expect--positive and negative rails, input signal and ground, output and ground.
Why then is there an "A/C" connection? This goes into a zener diode and a resistor, and has another pair next door, so my guess is that it's being rectified here. Unless this stands for something other than "alternating current" and I am totally off base. The board is at least three layers deep, so I lose track of it after the diode. I am not trying to use this for anything, just want to be able to look at audio circuits and understand what is going on!
Edit: Image upload didn't work for me, so I'm embedding an imgur link.
[image]Image:SWR Sound Corp. Power 2000|none[/image]
Why then is there an "A/C" connection? This goes into a zener diode and a resistor, and has another pair next door, so my guess is that it's being rectified here. Unless this stands for something other than "alternating current" and I am totally off base. The board is at least three layers deep, so I lose track of it after the diode. I am not trying to use this for anything, just want to be able to look at audio circuits and understand what is going on!
Edit: Image upload didn't work for me, so I'm embedding an imgur link.
[image]Image:SWR Sound Corp. Power 2000|none[/image]
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I have been plotting to build an amp for a while, and have been stalking these forums while I do. Today I started ordering parts to build the basic amp camp board, just so I have a place to get started. Coincidentally, I ran across some old audio amps at work while searching for something else entirely, so I decided to try plugging them in and playing around. I didn't get very far, though, as this board has a connection I don't understand. It has all the connections I would expect--positive and negative rails, input signal and ground, output and ground.
Why then is there an "A/C" connection? This goes into a zener diode and a resistor, and has another pair next door, so my guess is that it's being rectified here. Unless this stands for something other than "alternating current" and I am totally off base. The board is at least three layers deep, so I lose track of it after the diode. I am not trying to use this for anything, just want to be able to look at audio circuits and understand what is going on!
Edit: Image upload didn't work for me, so I'm embedding an imgur link. Also seems that I broke the initial post. Sorry about the rocky intro.
Why then is there an "A/C" connection? This goes into a zener diode and a resistor, and has another pair next door, so my guess is that it's being rectified here. Unless this stands for something other than "alternating current" and I am totally off base. The board is at least three layers deep, so I lose track of it after the diode. I am not trying to use this for anything, just want to be able to look at audio circuits and understand what is going on!
Edit: Image upload didn't work for me, so I'm embedding an imgur link. Also seems that I broke the initial post. Sorry about the rocky intro.
Looks like your first post didn't appear.
(edit. ignore this. I can see your op now.)
Cheers Jonathan
(edit. ignore this. I can see your op now.)
Cheers Jonathan
SWR Sound Corp. were specialist bass guitar amplifier manufacturers - likely the board is unsuitable for HiFi use but the A/C connection may well be an AC input for a small auxiliary DC power supply (the mark printed near the connector isn't obvious). Note the rectifier diode also nearby though. I can't see from just a pic. what the power is used for and it could be for a number of purposes, from powering an off-board relay to muting control or even separate supply rails for the front end. You need a schematic to be certain of the function but my guess is that guys in the Instruments and Amps forum will be more familiar with the design. Instruments and Amps - diyAudio
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As the board has a 'fan power' connection too I am going to guess that 'A/C' is a connection for an air cooling sensor. No airflow means the amp shuts down?
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