--00504502bd910c622304839d0fa9 Content-Type: text/plain; charset=ISO-8859-1 Joee, Can't you just include the transistor(s) in the feedback loop so that the opamp will compensate for the B-E drop? (Very Roughly as attached - if it gets through) RP On 7 April 2010 14:50, ivp wrote: > Hi all > > I'm finishing off the tachometer-to-dynamometer project and need help > with one last piece > > The final output of the circuit is an MC33171 op amp with V+ = 42V > derived from the 12V car battery with a small SMPS. It puts out 4V > per 1000rpm, up to 10,000rpm. That's working fine > > The dyno is unfortunately too much of a load at higher revs and the op > amp output won't go past 13V. Up to that 13V the output is still linear. > The amp has limiting for I vs V. It's specced at only 5mA at lower Vout > > So what I'm looking for is a simple voltage follower that will boost > current to a few 10s of mA. As the present drive seems adequate to > about 2,500rpm it seems probable that only a few extra mA will be > needed > > I've looked at tracking power supplies, voltage too low and a bit > too complicated. There must be a basic tracker, perhaps an emitter > follower type of thing, using a couple of transistors that can source > say 50mA. Is there a way of making an LM317 into a tracker for > example ? > > I tried some transistor experiments but couldn't get past the C-E drop > across the output. If really necessary I could add a 0.6V bias to the > op amp to compensate > > TIA > > Joe > -- > http://www.piclist.com PIC/SX FAQ & list archive > View/change your membership options at > http://mailman.mit.edu/mailman/listinfo/piclist > --00504502bd910c622304839d0fa9 Content-Type: image/gif; name="iboost.GIF" Content-Disposition: attachment; filename="iboost.GIF" Content-Transfer-Encoding: base64 X-Attachment-Id: f_g7pkm0rm0 R0lGODlhKQQcAvcAAAAAAIAAAACAAICAAAAAgIAAgACAgICAgMDAwP8AAAD/AP//AAAA//8A/wD/ /////wAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAMwAAZgAAmQAAzAAA/wAzAAAzMwAzZgAzmQAzzAAz/wBm AABmMwBmZgBmmQBmzABm/wCZAACZMwCZZgCZmQCZzACZ/wDMAADMMwDMZgDMmQDMzADM/wD/AAD/ MwD/ZgD/mQD/zAD//zMAADMAMzMAZjMAmTMAzDMA/zMzADMzMzMzZjMzmTMzzDMz/zNmADNmMzNm ZjNmmTNmzDNm/zOZADOZMzOZZjOZmTOZzDOZ/zPMADPMMzPMZjPMmTPMzDPM/zP/ADP/MzP/ZjP/ mTP/zDP//2YAAGYAM2YAZmYAmWYAzGYA/2YzAGYzM2YzZmYzmWYzzGYz/2ZmAGZmM2ZmZmZmmWZm 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