"W7RY" <[EMAIL PROTECTED]> made an utterance to the drakelist gang ---------------------------------------------------------------------- No. To measure ripple you simply measure across the filter capacitor with a DVM set to the AC position.
It should be millivolts (with a properly working filter capacitor). You can do this with any circuit. (There are special precautions if you're measuring high voltage). It's interesting to measure across the filter of an Astron power supply under full load. There is sometimes over .5 volts of AC ripple under heavy load. But there is no detectable or measurable hum on the output of the supply. The pass transistors act like a super filter. Same with a 3 terminal regulator. It is commonly used as a super filter in many applications. Very low noise and very stable. When you do measure, measure directly across the filter capacitor, you can pick up some inaccurate measurements if you just "clip to the chassis" far away from the cap. 73 Jim W7RY -----Original Message----- From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] On Behalf Of Jim Shorney Sent: Saturday, December 24, 2005 8:07 AM To: [EMAIL PROTECTED]; Ron Wagner Cc: drakelist@www.zerobeat.net Subject: Re: [drakelist] R4C +B Voltage "Jim Shorney" <[EMAIL PROTECTED]> made an utterance to the drakelist gang ---------------------------------------------------------------------- On Sat, 24 Dec 2005 07:09:05 -0500 (EST), Ron Wagner wrote: >you can use a 10uf or so capacitor rated for 200 volts in parallel with a >DVM (or analog volt meter) on the AC scale. That will basically give you >the AC ripple voltage on your DC line. Don't you mean in series with the DVM? -- TR7/RV7, TR6/RV6, T4XC/R4C, L4B, NCL2000, SB104A, R390A, GT550A/RV550A - all vintage, all the time! ---------------------------------------------------------------------- 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 ----------------------------------------------------------------------
