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TI (BB) has a micropower device (OPA336) that has decent DC specs... that might be the way I'll go. In general, Elantec parts have very good AC specs, but the offset currents are a little too high for my application. thanks to everyone for responding... i appreciate the feedback...

Yes... nowadays, they refer to these as "auto-zero" or "zero-drift" types. The MFRs I listed all have these types and I've looked into them... just wondering if anyone knew of any others. Thanks for the reply!

I need an ultra low-power, single op-amp with very good DC specs. Important specs are listed below. I have checked the usual suspects... AD, TI, Linear, but was wondering if anyone knew of a better MFR/product out there. Thanks... Isupply: 100uA MAX Voffset: 100uV MAX Ioffset: 10pA MAX

Hi, I'm searching for low tempco (preferrably < 20ppm) PCB mounted trimmer pots (preferrably SMT, but TM is OK). Bourns has a line of these, but there's little demand so no one stocks them. Anyone know where I can get low tempco trimpots? Thanks... John

Thanks heydave. Any idea where I can find a little more info on the matched cap technique? Sounds like it's worth exploring this as well...

Thanks all, I really appreciate your input. I have implemented some of the design ideas described and we are getting close. I am not seeing the high currents described by logbook, I can get nearly 50% efficency with the blocking cap and the inverter-driven push-pull on my primary. This is...

Thanks guys, I did add the blocking cap and it made a big difference. I have not tried the push-pull approach with the inverted signal on the other end (I presently have one side of the primary coil connected to GND). Will this improve the efficiency of my power transfer? My oscillator is...

Hi, responses are embedded below... What is the max. VTG difference across the barrier? 2V max difference across the barrier (5V in at primary is fixed, 3V out would be my minimum). Could you use charge pumps instead of trafo-s? If it can provide at least 500VAC isolation then it should be...

You may be right! But for now, I have signed on to try present a solution with the aformentioned specs. I provided a little more info on the xfmr part I am looking at in a previous post. Please let me know what additional data you would like, and I'd be happy to provide it. Thanks for your...

Unfortunately not. We've simplified the secondary side as far as we can go...

Thanks guys, I can adjust my oscillator frequency as needed, but it's around 100KHz at the moment. 3mA is my absolute max available current on the primary side. My schmitt inverter IC is the TI SN74AC14 (could be changed if necessary). The proto xfmr I'm using is the coilcraft Q4470-C...

Hi, I need a circuit to provide a few mA at 3-5V across an isolated barrier. The hard part is that my total available power on my primary side is 5V at 3mA. I am trying to debug a low power oscillator/xfmr/rectifier circuit. I seem to have problems driving my primary side xfmr with the...