| Electronics > Beginners |
| Old converter +5V to +6v/-6v circuit to replace |
| (1/1) |
| Daxxin:
just looking for some input how to replace this old part of schematic with something more actual and using less space . thats an UART circuit rs232 side +/- supply. |
| Yansi:
ST232 (or, if you feel you have too much money, then MAX232). |
| capt bullshot:
You might look for one of these 1W DC/DC modules: https://www.mouser.de/ProductDetail/CUI/PCN1-S5-D12-S?qs=sGAEpiMZZMvGsmoEFRKS8LplFs206tN2zFuLlXCrk2SUcLZoXUgtXA%3D%3D They've got basically the same circuit inside. Edit: The link points to a +/- 12V model, but other voltages are also available with these. Although +/- 6V is quite uncommon, I doubt you'll find one. +/- 5V, +/- 12V and +/- 15V are more common with these. Otherwise, for a RS232, +/- 12V is the usual voltage specification, not +/- 6V (though it'll work). |
| mariush:
If you don't need isolation and can live with ~+/- 10v (should be perfectly fine for rs232) , you could also use a couple of voltage doubler/inverting ICs ex. see https://www.digikey.com/product-detail/en/microchip-technology/TC7660SCPA/TC7660SCPA-ND/418702 use one for 5v->~2x5v and 2nd one for 10v -> -10v All you need is bunch of ceramic caps and diodes around these DIP ICs. edit: the circuit in your picture seems like it takes 5v and makes+/- 6v .. but isn't rs232 +/-12v? I think the minimum threshold was +/- 8v that's why i said +/- 10v should be fine. for +/-5v you'd only need one chip in inverter mode and theres cheaper ICs for that with max 5.5v input voltage, like max1720 for example A more flexible (adjustable output voltage, so could have +/- 6v or +/-12v) would be to use two *33063 *34063 switching regulator... super cheap, available in DIP, can use lower switching frequencies to make circuit on stripboard, online calculators and freeware software on sourceforge to tell you component vales if you don't want to use formulas in datasheet. Requires inductor, diode and a bunch of ceramic caps and resistors but for 10-50mA you would possibly need for rs232 these should be super cheap. Probably less than 1-1.5$ for two , one in step-up mode and one inverting mode (neg. voltage) |
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