kripacharya
Banned

Here's the specs :
Input is +12v capable of upto ~1amp.
output -12v (upto -12.8v) (not -10v or -11v or anything else) with atleast 60mA.
Should NOT use any of the myriad converter/ switch-mode chips.
Off-the-shelf junk-box chips & components are ok. E.g. 555, 2n7000, inductors, caps, zeners, opamps, comparators etc etc. Maybe even a small xfo, but avoid if possible.
design should be minimalistic & as simple as possible.
My thoughts were some form of Cuk circuit. But how to design it right ? Here's one i was playing with (its a LTSpiCE asc file. Rename it), but i don't like it.... :???:
Forums suggestions & guidance please ?
Input is +12v capable of upto ~1amp.
output -12v (upto -12.8v) (not -10v or -11v or anything else) with atleast 60mA.
Should NOT use any of the myriad converter/ switch-mode chips.
Off-the-shelf junk-box chips & components are ok. E.g. 555, 2n7000, inductors, caps, zeners, opamps, comparators etc etc. Maybe even a small xfo, but avoid if possible.
design should be minimalistic & as simple as possible.
My thoughts were some form of Cuk circuit. But how to design it right ? Here's one i was playing with (its a LTSpiCE asc file. Rename it), but i don't like it.... :???:
Forums suggestions & guidance please ?