At 12:09 PM 11/8/00 +1100, Tony Nixon wrote: >I am thinking, I will specify that regulator so I can use a DC wart and >then I only need smaller stabillity caps on the regs instead of the big >1000uF beasty. > >I can also dispense with the bridge and use a single IN4001 to provide >battery reversal protection, and get an extra 0.6V. > >That also leaves the wall wart open for other uses too if need be. > >The savings on the cap and bridge can then help pay for the other reg. Watch out, Tony. Remember that line voltage varies widely depending upon location. My products have to work over a 90Vac to 130Vac range (115 Vac nominal). At the low end of your range, I doubt that you would get the minimum voltage needed. Plus - remember that a LM293x starts to consume much current when in dropout - this will reduce the available voltage even more. Why not check with your local burglar alarm supply places. Over here, I can get a 16Vac or 18Vac (large) wall warts with screw terminals rated at 40 VA for about Can $7.00 (from the wholesaler). I use a fair number of them: 12V gell cell chargers, RTS intercom power supplies, etc. You have to provide a rectifier but you'd have oodles of headroom. Just a thought. dwayne Dwayne Reid Trinity Electronics Systems Ltd Edmonton, AB, CANADA (780) 489-3199 voice (780) 487-6397 fax Celebrating 16 years of Engineering Innovation (1984 - 2000) * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * Do NOT send unsolicited commercial email to this email address. This message neither grants consent to receive unsolicited commercial email nor is intended to solicit commercial email. -- http://www.piclist.com hint: To leave the PICList mailto:piclist-unsubscribe-request@mitvma.mit.edu