--- In [EMAIL PROTECTED], "turbulatordude" <[EMAIL PROTECTED]> wrote: > > --- In [EMAIL PROTECTED], Jon Elson <[EMAIL PROTECTED]> wrote: > > Fred Smith wrote: > > > > >I have a control signal that varies from 0-5vdc and want to use it > on > > >another device that needs 0-10vdc. Fast control response is not > > >required. > > > > > >Available power is 5vdc and 12vdc both regulated. > > > > > >A solution that fits home-hobbyists budgets is required. > > > > > >What kinds of solutions can be used? > > > > > >An LM317 variable voltage regulator might be a possible solution > > >(certainly cheap). > > > > > >Is there a ready to go solution already available? > > > > > > > > I think this would be difficult with just a regulator chip. An OP > Amp > > is the tool of choice. Use a rail-to-rail op amp if you really > need to > > go all the way to zero. Or, power the op amp from +12 and -5 or - > 12 V, > > so it can deliver zero volts when needed. > > > > The circuit would be to connect the 0-5 V input to the + input of > the > > op amp. Connect a 10 K resistor from the output to the - input. > > Connect another 10K resistor from the - input to the signal ground. > > The output will now swing from 0-10 V as the input goes from 0-5. > > You may need a small capacitor, say 100 pF in parallel from output > > to - input to stabilize the op amp. > > > > Jon > > If you can get the rail to rail from Radio Shack, you can use a small > perf board and get it put together in short order. > > If not, a 15 volt transformer with center tap would offer the ability > to get enough voltage spread for a 741 op-amp. it uses the negative > to get below zero and Forrest Mimms has a small booklet on op-amps > with circuits at radio shack. > > still all fit on a perf board from RS > > Dave
Use an LM324 quad (14 PIN) or LM358 (8 pin) dual single supply op amp. Hook it up in a simple non-inverting configuration (or use two of the amps both inverting for extra buffering). Configure one of the op amps to have a 2X gain (better to put in a small pot to adjust the exact gain). Google for the app notes or the spec sheet on the chips. There is also an opportunity to put in a level of filtering to change the frequency response of the circuit to exclude noise or interference from getting into the output. For precision applications you may have to provide an offset trim but in most case you don't need that and the circuit is a chip and 3 resistors. The 741 needs + and - supply while the 324 series can run from +5 to + 30 VDC supply. You only need about .6 volt more supply than the output so the +12 would be perfect. Since gain is not dependent on supply voltage then even unregulated DC will work. Tom C Old analog/digital engineer Addresses: FAQ: http://www.ktmarketing.com/faq.html FILES: http://groups.yahoo.com/group/CAD_CAM_EDM_DRO/files/ Post Messages: [EMAIL PROTECTED] Subscribe: [EMAIL PROTECTED] Unsubscribe: [EMAIL PROTECTED] List owner: [EMAIL PROTECTED], [EMAIL PROTECTED], [EMAIL PROTECTED] Moderator: [EMAIL PROTECTED] [EMAIL PROTECTED] [EMAIL PROTECTED] [Moderators] URL to this group: http://groups.yahoo.com/group/CAD_CAM_EDM_DRO OFF Topic POSTS: General Machining If you wish to post on unlimited OT subjects goto: aol://5863:126/rec.crafts.metalworking or go thru Google.com to reach it if you have trouble. http://www.metalworking.com/news_servers.html http://groups.yahoo.com/group/jobshophomeshop I consider this to be a sister site to the CCED group, as many of the same members are there, for OT subjects, that are not allowed on the CCED list. NOTICE: ALL POSTINGS TO THIS GROUP BECOME PUBLIC DOMAIN BY POSTING THEM. DON'T POST IF YOU CAN NOT ACCEPT THIS.....NO EXCEPTIONS........ bill List Mom List Owner Yahoo! Groups Links <*> To visit your group on the web, go to: http://groups.yahoo.com/group/CAD_CAM_EDM_DRO/ <*> To unsubscribe from this group, send an email to: [EMAIL PROTECTED] <*> Your use of Yahoo! Groups is subject to: http://docs.yahoo.com/info/terms/
