3V频闪灯电路的疑问

AnJoy · 发表于 2010-3-18 17:46

马上注册，结交更多好友，享用更多功能，让你轻松玩转社区。

x

本帖最后由 AnJoy 于 2010-3-19 10:54 编辑

按电路图做了这个闪烁电路，当我把灯泡换成LED怎么就直亮不闪烁了呢。
如果想让把灯泡换成LED能闪烁，请问电路改怎么修改呢。
按电路图做了这个闪烁电路，当我把灯泡换成LED怎么就直亮不闪烁了呢。

laomao0000 · 发表于 2010-3-18 17:52

看不见图

kgje · 发表于 2010-3-18 18:26

看不到图。

artie · 发表于 2010-3-18 20:37

也许是灯泡和led 的导电特性不同吧

SDKTank · 发表于 2010-3-20 20:09

登录/注册后可看大图

试试这个
神奇的传送门:http://wenwen.soso.com/z/q167642662.htm

SDKTank · 发表于 2010-3-20 20:19

登录/注册后可看大图

Parts:

R1_________________Photo resistor (any type)
R2________________100K 1/2W Trimmer Cermet
R3,R4______________10K 1/4W Resistors
R5________________470R 1/4W Resistor
R6_________________47R 1/4W Resistor

C1________________220΅F 25V Electrolytic Capacitor

D1______________1N4148 75V 150mA Diode
D2_________________LED Any type and color (See Notes)

Q1,Q2____________BC337 45V 800mA NPN Transistors

SW1_______________SPST Switch

B1__________________3V (Two 1.5V AA or AAA cells in series, etc.)

Circuit operation:

This circuit adopts the rather unusual Bowes/White emitter coupled multivibrator circuit. The oscillation frequency is about 1Hz and is set by C1 value. The LED starts flashing when the photo resistor is scarcely illuminated. The onset of flashing can be set by trimming R2.

Notes:

Best results in flashing frequency can be obtained using for C1 a value in the 100 to 1000΅F range.

To drive a filament lamp the following changes must be made:

Use a 2.2 to 3V, 250-300mA lamp in place of the LED

R2 = 10K 1/2W Trimmer Cermet

R3, R4 = 1K 1/4W Resistors

R6 = 1R 1/4W Resistor

C1 = 470 to 1000΅F 25V Electrolytic Capacitor
In LED-mode operation the stand-by current consumption is less than 400΅A.

In Lamp-mode operation the stand-by current consumption is about 3mA.

SDKTank · 发表于 2010-3-20 20:20

可以用万用表测测二极管通电电压

kt333vl · 发表于 2010-3-21 02:18

频闪要有取样的，可在LED发光管上并联一电阻，470--3K 慢慢试好，注意LED的正负极。

		自动登录	找回密码
密码			注册成为会员，享受更多功能。