"Gerry" <[EMAIL PROTECTED]> made an utterance to the drakelist gang ---------------------------------------------------------------------- That sounds about right. It's a question of timing and voltage rise as you bring up line voltage. A DC power supply such as the PS-7 is meant to be turned on all at once. There is really nothing to be gained in slow turn on except for troubleshooting. I have a PS-7 and took it to the bench at work and put it through the "ringer". It will do 30 amps continuous if adequately cooled. The transformer uses flat wound copper and looks (at least from what I can tell) to be able to supply at least that much current and more. The only limitations are regulator transistors temperature rise and the bridge rectifier which is rated for 35 amps average forward current and I think either 200 or 400 amps peak surge. At 25 amps, it's loafing. The so-called cooling fan isn't really effective, except for cooling off the enclosure. The forward regulating transistors don't get any airflow due to the construction of the internal frame but it's better than nothing. Incidentally, I did away with the AC connection to the on/off switch inside the TR-7. I'm using a "Mother of all DC relays" and a wall wart plugged in the fan socket. This required a little rewiring. The wall wart is on all the time but the TR-7 on/off switch activates the big relay DC coil whose contacts are connected to the AC line inside the PS-7. No low-level AC hum in the audio!
-----Original Message----- From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] On Behalf Of Ron Wagner Sent: Thursday, March 23, 2006 9:42 PM To: Kevin LaHaie Cc: drakelist@www.zerobeat.net; recipient list not shown: Subject: Re: [drakelist] Interesting End: PS7 Voltage Regulation Problem Ron Wagner <[EMAIL PROTECTED]> made an utterance to the drakelist gang ---------------------------------------------------------------------- Kevin, If I understand you correctly, you were only feeding a percentage of the design voltage to the PS7 because of the variac. Let me make a guess as to your problem. The regulator board needs a specified minimum voltage to run correctly. If you were in fact "starving" the regulator of the correct operating voltage, anything is possible. Anything including the distruction of various components within the regu;lator board, feedback loops in the regulator oscilating, and any number of other strange things. So my guess would be the 723 had its "boxers in a bunch" and did whatever it pleased and did not get reset until voltages got within specs for the design. 73, Ron ---------------------------------------------------------------------- Submissions: drakelist@www.zerobeat.net Unsubscribe: [EMAIL PROTECTED] - unsubscribe drakelist in body Hopelessly Lost: [EMAIL PROTECTED] - help in body of message Zerobeat Web Page: www.zerobeat.net - sponsored by www.tlchost.net ---------------------------------------------------------------------- ---------------------------------------------------------------------- Submissions: drakelist@www.zerobeat.net Unsubscribe: [EMAIL PROTECTED] - unsubscribe drakelist in body Hopelessly Lost: [EMAIL PROTECTED] - help in body of message Zerobeat Web Page: www.zerobeat.net - sponsored by www.tlchost.net ----------------------------------------------------------------------
