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G8MNY > TECH 09.08.26 16:43l 38 Lines 1203 Bytes #9 (0) @ WW
BID : 1535_GB7CIP
Subj: Splitting a floating PSU
Path: JH4XSY<N3HYM<CX2SA<VK7AX<GB7CIP
Sent: 260809/0738Z @:GB7CIP.#32.GBR.EURO #:1535 [Caterham Surrey GBR] $:1535_GB
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 �3V to �50V.
ﾚﾄﾄﾄﾄﾄﾄﾄﾄｿ +
ｳ ﾃﾄﾄﾄﾄﾂﾄﾄﾄﾄﾂﾄﾄﾄ>+ve
ｳFloatingｳ 1K ｳ/
ｳ ｳ ﾃﾄﾄｴNPN
ｳ Power ｳ _ｳ_ ｳ\e
ｳ ｳ D1\_/ ﾃﾄﾄﾄ>0V
ｳ Supply ｳ ｳ ｳ/e
ｳ ｳ ﾃﾄﾄｴPNP
ｳ ｳ 1K ｳ\
ｳ ﾃﾄﾄﾄﾄﾁﾄﾄﾄﾄﾁﾄﾄﾄ>-ve
ﾀﾄﾄﾄﾄﾄﾄﾄﾄﾙ -
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 darlingtons 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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