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本文介绍了如何使用NE555制作负电压产生电路，电路简单，取材容易，唯一缺点是输出电流小，输出电压不稳压，可在要求不高的场合使用。

This simple circuit is a good solution to the powering a dual supply op amp from a single battery problem. The circuit simply takes a positive voltage and inverts it. It uses only one 555 timer and a few other passive components, so it doesn't add much in the way of size and cost to a project.

元件清单：

Part	Total Qty.	Description	Substitutions
R1	1	24K 1/4 Watt Resistor
R2	1	56K 1/4 Watt Resistor
C1	1	3300pF 25V Ceramic Capacitor
C2	1	47uF 25V Electrolytic Capacitor
C3	1	10uF 25V Electrolytic Capacitor
C4	1	100uF 25V Electrolytic Capacitor
D1, D2	2	1N4148 Silicon Diode
U1	1	555 Timer
MISC	1	Wire, Board

关键词： 通过NE555产生负电压