Comments for Stew's Spot http://www.stewartallen.org Geeky stuff I'm up to Sat, 21 Jan 2012 12:34:12 +0000 hourly 1 http://wordpress.org/?v=3.3.1 Comment on Latest Function Generator progress by zippys123 http://www.stewartallen.org/2010/05/latest-function-generator-progress/comment-page-1/#comment-1367 zippys123 Sat, 21 Jan 2012 12:34:12 +0000 http://www.stewartallen.org/?p=480#comment-1367 hi is eagle cad files available it looks promising.. hi

is eagle cad files available it looks promising..

]]> Comment on DVM issues and isolated power supplies by Stewart http://www.stewartallen.org/2010/08/dvm-issues-and-isolated-power-supplies/comment-page-1/#comment-1350 Stewart Fri, 23 Dec 2011 11:31:05 +0000 http://www.stewartallen.org/?p=776#comment-1350 Yes using a NE555 should be fine. Yes using a NE555 should be fine.

]]> Comment on DVM issues and isolated power supplies by V K singh http://www.stewartallen.org/2010/08/dvm-issues-and-isolated-power-supplies/comment-page-1/#comment-1349 V K singh Fri, 23 Dec 2011 09:31:57 +0000 http://www.stewartallen.org/?p=776#comment-1349 can the circuit work with NE555 ( non-CMOS version of 555 IC)? can the circuit work with NE555 ( non-CMOS version of 555 IC)?

]]> Comment on DVM issues and isolated power supplies by Stewart http://www.stewartallen.org/2010/08/dvm-issues-and-isolated-power-supplies/comment-page-1/#comment-1345 Stewart Fri, 16 Dec 2011 06:35:56 +0000 http://www.stewartallen.org/?p=776#comment-1345 C2 is not needed. You can leave pin 5 floating C2 is not needed. You can leave pin 5 floating

]]> Comment on DVM issues and isolated power supplies by vk singh http://www.stewartallen.org/2010/08/dvm-issues-and-isolated-power-supplies/comment-page-1/#comment-1344 vk singh Fri, 16 Dec 2011 06:18:50 +0000 http://www.stewartallen.org/?p=776#comment-1344 There is no capacitor disgnated as C2, is it not reuired or we need a capacitor as C2 connected to pin 5? There is no capacitor disgnated as C2, is it not reuired or we need a capacitor as C2 connected to pin 5?

]]> Comment on DVM issues and isolated power supplies by Stewart http://www.stewartallen.org/2010/08/dvm-issues-and-isolated-power-supplies/comment-page-1/#comment-1343 Stewart Thu, 15 Dec 2011 21:28:09 +0000 http://www.stewartallen.org/?p=776#comment-1343 Yes it can easly supply 5mA. Yes a 1N4148 will work. Yes it can easly supply 5mA. Yes a 1N4148 will work.

]]> Comment on DVM issues and isolated power supplies by v k singh http://www.stewartallen.org/2010/08/dvm-issues-and-isolated-power-supplies/comment-page-1/#comment-1342 v k singh Thu, 15 Dec 2011 13:24:59 +0000 http://www.stewartallen.org/?p=776#comment-1342 I need about 3 to 5mA output current, What is the max output current from the circuit? Can I use 1N4148 in place of BAT85? I need about 3 to 5mA output current, What is the max output current from the circuit?

Can I use 1N4148 in place of BAT85?

]]> Comment on DVM issues and isolated power supplies by Stewart http://www.stewartallen.org/2010/08/dvm-issues-and-isolated-power-supplies/comment-page-1/#comment-1335 Stewart Sat, 10 Dec 2011 18:46:35 +0000 http://www.stewartallen.org/?p=776#comment-1335 No real changes to make, it should just work. Most of the DVM's run fine at 12v. If you specifically need 9V on the output you could always add a Linear Regulator on the input. ie power the whole circuit at 9v. I'd suggest a 78L09 or equivalent. No real changes to make, it should just work. Most of the DVM’s run fine at 12v. If you specifically need 9V on the output you could always add a Linear Regulator on the input. ie power the whole circuit at 9v. I’d suggest a 78L09 or equivalent.

]]> Comment on DVM issues and isolated power supplies by vk singh http://www.stewartallen.org/2010/08/dvm-issues-and-isolated-power-supplies/comment-page-1/#comment-1334 vk singh Sat, 10 Dec 2011 04:26:57 +0000 http://www.stewartallen.org/?p=776#comment-1334 Further to my comment yesterday for input voltage of 12 V , I also need the output current at about 3 to 5 mA, please suggest cahnges in the circuit. Further to my comment yesterday for input voltage of 12 V , I also need the output current at about 3 to 5 mA, please suggest cahnges in the circuit.

]]> Comment on DVM issues and isolated power supplies by vksingh http://www.stewartallen.org/2010/08/dvm-issues-and-isolated-power-supplies/comment-page-1/#comment-1332 vksingh Fri, 09 Dec 2011 07:05:41 +0000 http://www.stewartallen.org/?p=776#comment-1332 I have a DVM to measure my car battery voltage ( 12 V DC), however I cannot power the DVM with the same battery, Can you modify the circuit so that I get 9V output isolated to power the DVM with 12 V input from car battery I have a DVM to measure my car battery voltage ( 12 V DC), however I cannot power the DVM with the same battery, Can you modify the circuit so that I get 9V output isolated to power the DVM with 12 V input from car battery

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