7815稳压电源电路图
连续可调的双电源(正负对称电源)。此电路由一块7815和一块7915三端稳压器对称连接,即可获得一组正负对称的稳压电源,而且输出电压值可各自单独调节,也可同步调节。光纤电话机
ahrp 电路如图所示,由变压器输出的交流双18V电压经D1~D4整流,C1、C2滤波得到一直流电压,其中变压器双电源的中心抽头作为公共接地端,然后分别把该直流电压正负极接入7815的①脚和7915的③脚。7815的③脚接到电位器W2的滑动触片“d”上,7915的①脚接到电位器W1的滑动触片“C”上。当将触片“C”滑到“0”端接地时,调节W2,即可从“a”端得到“+6~+15V”的正向可变电压;若将触片“d”滑到“0”端接地,调节W1,在“b”端就可得到“-6~-15V”的负向可变电压,将W1、W2换成同轴电位器,将获得正负对称的可调电源,输出电压值在±6V~±15V之间连续可调,可达到同步调节的目的。 本电路的7815、7915三端稳压块上应加装散热片,做散热用。
如图所示7815稳压电源电路图
7915/LM7915应用电路
作者:本站 来源:www.elecfans 发布时间:2008-10-14 16:18:24 [收 藏] [评 论]
7915/LM7915应用电路
管道巡检机器人
*Required if regulator is separated from filter capacitor by
more than 3". For value given, capacitor must be solid
集热罩tantalum. 25μF aluminum electrolytic may be substituted.
†Required for stability. For value given, capacitor must be
solid tantalum. 25μF aluminum electrolytic may be substituted.
Values given may be increased without limit.
For output capacitance in excess of 100μF, a high current
乳腺疏通精油diode from input to output (1N4001, etc.) will protect the
regulator from momentary input shorts.
7915 Typical Applications (Continued)
Load Regulation at DIL = 1A 40mV 2mV
Output Ripple, CIN = 3000μF, IL = 1A 100 μVms 100 μVms
Temperature Stability 50mV 50mV
paas系统
Output Noise 10Hz £ f £ 10kHz 150 μVms 150 μVms
*Resistor tolerance of R4 and R5 determine matching of (+) and (−) outputs.
**Necessary only if raw supply filter capacitors are more than 3" from regulators.