Search found 5 matches
- Mon Jan 24, 2005 7:00 pm
- Forum: General Discussion
- Topic: ground isolation problem
- Replies: 12
- Views: 7230
Re: ground isolation problem
the meter only needs 1mA and powers up fine with the 1:1 trans and the 7809. I don't know what the impedance and power rating for the trans are but it seems sufficient.
- Mon Jan 24, 2005 5:45 pm
- Forum: General Discussion
- Topic: ground isolation problem
- Replies: 12
- Views: 7230
Re: ground isolation problem
This is a C + C digital panel meter. 7-12 volt supply. I have changed the surface mount voltage dividers to read in the 0-200V scale. There is not much info out there on these things (which is how I got into this mess). This site has most of the info (almost none) http://shop.store.yahoo.com/webtron...
- Mon Jan 24, 2005 5:37 pm
- Forum: General Discussion
- Topic: ground isolation problem
- Replies: 12
- Views: 7230
Re: ground isolation problem
yes,the transformer should have done it. There is no physical link between the grounds. What I don't understand is that my commercial benchtop power supply is able to power the meter and read its own output on another channel. The meter also works fine if powered by a 9v battery and meters my homebu...
- Mon Jan 24, 2005 9:59 am
- Forum: General Discussion
- Topic: ground isolation problem
- Replies: 12
- Views: 7230
ground isolation problem
I am building some adjustable power supplies for my students and have run into a problem with the digital panel meters Im using. After I received them I discovered that they cannot use a common ground to both power the unit (7-12V) and measure the power supply adjustable output (LM317). I then tried...
- Wed Dec 19, 2001 4:05 pm
- Forum: General Discussion
- Topic: DC to DC voltage doubler
- Replies: 4
- Views: 4425
DC to DC voltage doubler
Im building a counter that is operated by a small 2.4 volt solar panel that will charge up a 1000mfd capacitor and then discharge when a switch is hit to advance the counter. The counter is 4.5 volts so I need to double my voltage before it goes to the cap. This charging of the cap can take a while ...