positve and negative power supply

Sean Bartholomew · 2004-11-25T00:44:38+00:00

im building a circuit using the 4052 cmos chip.i need to connect the 4052 Vee to at least as negative as -4V foraudio reasons. it cant be at 0 for my purposes.i would like the unit to fit into the 9V supply format (widely used inthe guitar fx world) but ive pursuaded myself to go to a 12V supply asi need a regulated +5V supply (not applicable with a +9V trans if iintend to have -4V unless i get a REGULATED 9Vtrans...hmmm....possible).now...how do i get a negative voltage without floating the ground (virtualground).what i had in mind was to take a 12V in. regulate it to 9V and 4V witha 78L09 and a 317T respectively.assign the +4 to ground (virtual). this would bring the +9V down to+5V (connected to all the components) and the 0V would then become -4Vwhich i would assign to the Vee pin of the 4052. i may even give the4052 power pin a +8V feed (from the +12V on the transformer directly)for more audio headroom but the fact that its unregulated may not be asatisfactory solution and +5V is fine.this would mean that i cannot connect the sleeves of the outside audioconnections to internal ground as it really is +4V with respect to theoutside ground world but i COULD make sure that they at least allconnect together albeit isolated from the internal circuitry.my trusted friend however does not recommend in the slightest that ihave this virtual ground setup.any ideas?

Nov 25, 2004 20 Replies

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Fred Bloggs 21 years ago

If you are talking about the 7805 and 4.7V zener combination, then the COMMON terminal of the 7805 will supply enough bias current for the zener. Keep in mind that the zener will sink this current plus the +5V load current minus the 4V load current.

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positve and negative power supply

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