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G8MNY > TECH 10.09.20 01:16l 49 Lines 1538 Bytes #999 (0) @ WW
BID : 11161_GB7CIP
Read: GUEST
Subj: Splitting a floating PSU
Path: IZ3LSV<IQ2LB<GB7COW<N9PMO<JE7YGF<LU4ECL<ZL2BAU
Sent: 200906/2316Z @:ZL2BAU.#79.NZL.AUNZ #:3458 [Waimate] $:11161_GB7CIP
4/0617Z 7384@PY2BIL.SP.BRA.SOAM LinBPQ6.0.20
R:190704/0617Z 2294@VE1MPF.#MCTN.NB.CAN.NOAM BPQ6.0.16
R:190704/0616Z 52393@W9ABA.#WCWI.WI.USA.NOAM BPQ6.0.18
R:190704/0616Z 25023@KE0GB.#SECO.CO.USA.NOAM LinBPQ6.0.18
R:190704/0615Z 11368@W0LVJ.#TWF.ID.USA.NOAM BPQ6.0.18
R:190704/0611Z @:GB7CIP.#32.GBR.EURO #:11161 [Caterham Surrey GBR]
From: G8MNY@GB7CIP.#32.GBR.EURO
To : TECH@WW
By G8MNY (New Aug 06)
(8 Bit ASCII graphics use code page 437 or 850, Terminal Font)
Here is a simple way to spit a single floating power supply into +/- rails. It
can be for any voltage 6V-100V to give ñ3V to ñ50V.
ÚÄÄÄÄÄÄÄÄ¿ +
³ ÃÄÄÄÄÂÄÄÄÄÂÄÄÄ>+ve
³Floating³ 1k ³/
³ ³ ÃÄÄ´NPN
³ Power ³ _³_ ³\e
³ ³ D1\_/ ÃÄÄÄ>0V
³ Supply ³ ³ ³/e
³ ³ ÃÄÄ´PNP
³ ³ 1k ³\
³ ÃÄÄÄÄÁÄÄÄÄÁÄÄÄ>-ve
ÀÄÄÄÄÄÄÄÄÙ -
The asymmetrical currents & voltages will affect the components needed (e.g.
transistors have to handle peak offset current & heat), in some applications,
e.g. value of 1k R may be 39k on 100V. Higher currents may need darlings or
P & N ch MOSFETs.
The above circuit should provide adequate balance for testing most things that
need a balanced supply.
D1 provides some cross over bias keeping the transistors in class B, 2 diodes
in series may do better but easy to get into class AB/A & get hot when this is
not needed!
Y Don't U send an interesting bul?
73 de John G8MNY @ GB7CIP
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