This is a multi-part message in MIME format. ------=_NextPart_000_0063_01C1E6D0.6971DB60 Content-Type: text/plain; charset="iso-8859-1" Content-Transfer-Encoding: 7bit I've been fascinated by Olin's charger design. I'm not really a hardware guy, but I wonder if somebody could comment on the variation of Olin's design shown in the attached schematic (sorry for the bandwidth!). This version replaces 2 op amps (the voltage follower for the PWM signal and the differential amp for the current sense) with a single op-amp. It does so by summing the PWM output and the lower end of the sense resistor to the positive input; and ground and the higher end of the sense resistor to the positive input. This should mean that the op-amp will try its hardest to ensure that: Vpwm + Vsenselo = Vgnd + Vsensehi or: Vpwm = Vsensehi - Vsenselo Thus the opamp should drive enough current thru the transistors to balance the PWM voltage. Did I analyze this right? Does it have a chance of working? Bob Ammerman RAm Systems ------=_NextPart_000_0063_01C1E6D0.6971DB60 Content-Type: image/gif; name="CHARGER.GIF" Content-Transfer-Encoding: base64 Content-Disposition: attachment; filename="CHARGER.GIF" R0lGODdhsQK6AfcAAAAAAIAAAACAAICAAAAAgIAAgACAgMDAwMDcwNTQyEAgAGAgAIAgAKAgAMAg AOAgAABAACBAAEBAAGBAAIBAAKBAAMBAAOBAAABgACBgAEBgAGBgAIBgAKBgAMBgAOBgAACAACCA AECAAGCAAICAAKCAAMCAAOCAAACgACCgAECgAGCgAICgAKCgAMCgAOCgAADAACDAAEDAAGDAAIDA AKDAAMDAAODAAADgACDgAEDgAGDgAIDgAKDgAMDgAODgAAAAQCAAQEAAQGAAQIAAQKAAQMAAQOAA QAAgQCAgQEAgQGAgQIAgQKAgQMAgQOAgQABAQCBAQEBAQGBAQIBAQKBAQMBAQOBAQABgQCBgQEBg QGBgQIBgQKBgQMBgQOBgQACAQCCAQECAQGCAQICAQKCAQMCAQOCAQACgQCCgQECgQGCgQICgQKCg QMCgQOCgQADAQCDAQEDAQGDAQIDAQKDAQMDAQODAQADgQCDgQEDgQGDgQIDgQKDgQMDgQODgQAAA gCAAgEAAgGAAgIAAgKAAgMAAgOAAgAAggCAggEAggGAggIAggKAggMAggOAggABAgCBAgEBAgGBA gIBAgKBAgMBAgOBAgABggCBggEBggGBggIBggKBggMBggOBggACAgCCAgECAgGCAgICAgKCAgMCA gOCAgACggCCggECggGCggICggKCggMCggOCggADAgCDAgEDAgGDAgIDAgKDAgMDAgODAgADggCDg 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