制作一个直流稳压电源电路图（电压可调范围在5~12v）

制作一个直流稳压电源电路图（电压可调范围在5~12v），方法如下：

0到100v自制可调电源电路图 自制0–100可调电源0到100v自制可调电源电路图 自制0–100可调电源


0到100v自制可调电源电路图 自制0–100可调电源


1、先来了解一下所要使用的元件，我们这次选用的器件有三端可调式集成稳压器有输出为正电压的CW117、CW317等系列和输出为负电压的CWl37、CW337等系列 。以LM317为例。

2、由上述原理图我们可以很直观地看到所使用的元件有LM317、电阻R1、还有一个可调电阻，输出电压值和这个可调电阻有一定的关系，想要输出5~12V的电压，那么Rp/R1>=3.35或Rp/R1<=9.45，设定R1=240Ω，这Rp可以在800Ω~2260Ω之间选择调整。

3、可调电阻在调节的时候可能会产生一些波动导致输出波形不是那么的好，在输入或输出端电源正负连反的话还有可能造成整个电路的损坏，因此我们可以加上一些保护电路，具体见下图

扩展资料：

设计直流稳压电源时，因为电流电压会有波动，为减小可调电阻RP上的波纹电压，可并联一个10uF的电容C，二极管VD1起到输入短路保护作用。若输入端短路时，使CO通过二极管放电，以便保护集成稳压器内部的调整管，VD2提供一个放电回路，保护稳压器。

可调式的0-30V 0-3A的直流稳压电源,用LM338K怎么做啊，给个电路图和原件好吗，急需，谢谢。

你看看吧

LM338组成的13.8V,5A大功率稳压电源电路图

Many times we needed one relatively powerful supply in order to we supply various appliances with + 13.8V, as transceivers CB, charge lead-acid batteries, etc. The circuit it uses known completed that is capable gives in the his exit, current in continuous operation 5A and 12A peak current. It does not only need few external component. Exist a point whICh it will be suped you are careful in the drawing and in board. Board has been drawn so as to exist the sibility of using also two case types completing. In the first case the IC1 in case TO-220 is placed above in PCB, in second with case TO-3, it CAN it’s placed above in heatsink and terminal his they are connected in the connector G3, in this case, certain we lee empty the place of IC1 above in pcb. A other point is the refrigeration of rectifier B1. If it’s placed above in pcb, then it will be suped clinch on his piece aluminium in form U, in opite case, if the rectifier B1 is placed except pcb should clinch in a point in his chassis and terminal are connected with suitable cross-section cables in the corresponding points above in pcb. The regulation of voltage in + 13.8V become with the trimmer TR1, (multiturn). The IC1 should in ry case be placed on one suitable heatsink, which good is supportable by one fan. All the connections by the circuit become with big cross-section cables , beacause the current that passes from in them is enough high. If they are not used the connectors that appear in pcb, then you can place PINs or solderer the cables at straight line above in pcb

R1=270R 1/4W 2%

C4-5=10uF 25V

TR1=4k7 (Multiturn)

D1-2=1N4002 (1A/100V)

C1=10000uF 40V

B1=25A Bridge Rectifier

C2-3=100 nF 100V Polyester

IC1=LM338

T1=220Vac/15VAC - 8A Mains Transformer

S1=2 Pole Single Throw Mains Switch

F1=mA Fuse

如何做一个大功率可调电路 想自制一个大功率可调电源

输出可调的稳压电源要达到24伏直流，他的输入直流电压应该在30伏。你的变压器才24伏是不够的，并且变压器功率太小才15瓦。你说的的输出1.5安培13伏已经是19.5瓦了，明显超载了发热是必然的。

问题主要是：变压器次级电压太小，应该30伏，变压器功率太小，应该50瓦才能出来2安培24伏。

可调稳压电源电路图 图

可调稳压电源电路图

用220V-12V变压器，经整流滤波形成直流分压成6V后，接到7805上后可输出5V稳压输出，接到7905上输出-5V稳压输出。12V直接接到7812和72上，可以得到正负12V稳压输出。

至于1-30V可调，那就用220V-30V变压器，整流滤波后，用功率管组成调压电路，用电位器控制其基极电位，来调节管压降，从而达到调压的目的。

用LM317做

电压无极调节

DIY线性可调稳压电源，求电路图

图中变压器的次级电压标出是28伏，经桥式整流后得到25.2伏。再经电容滤波后带负载大约是30.24伏。要想在输出端得到37伏的稳定电压，LM317模块的电源输入端少要有40伏电压才行。

因此，变压器次级只有28伏是不够的。再说变压器次级绕组还会产生电压降，所以次级电压选择还应考虑在增加几伏特。

仅供参考。

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