教你$56自制light kit，有break 燈control

我想問300Ohm會唔會暗d??

差好少，唔多覺

想問吓白色果粒 LED 最大 current , voltage  and power   係几多 ?

我都想請教, 如果想connect 去無炭motor, 又應該connect 個motor 三條線中邊兩條條先o岩呢?

原帖由 vrally582 於 2006-9-2 01:01 發表
想問吓白色果粒 LED 最大 current , voltage  and power   係几多 ?

白led，通常都係3V~3.3V，CURRENT 20A左加都好光架啦

原帖由 lewislee 於 2006-9-2 02:28 發表
我都想請教, 如果想connect 去無炭motor, 又應該connect 個motor 三條線中邊兩條條先o岩呢?

唔識，

不過你可以用電錶CHECK一CHECK，普通電錶仔，鴨街華輝有售，$50左右

原帖由 lewislee 於 2006-9-2 02:28 發表
我都想請教, 如果想connect 去無炭motor, 又應該connect 個motor 三條線中邊兩條條先o岩呢?

You may consider the brushless motor as an ac synchrouous motor with premenant magnet and the three wires as a 3 ph ac source. So, connecting the relay to any 2 out of 3 wires is similar to connecting the relay to a single phase ac source. No idea on the ac voltage. You can simply use a mulit meter to check it and buy an relay with appropriate operating voltage.

The circuit proposed by 艾力  is simple, reliaible and easy to bulid. Very good.

原帖由 KMB182 於 2006-8-29 20:21 發表
我想問係咪要用1/4W 100ohms嫁電阻?..(break燈)

The common nominal current and voltage drop of an LED are around 20mA and 3-3.6v (depends on the color, just assuming it is 3.3v). If you would like to connect the LED to a 7.2V source in series with an resistor, the voltage drop across the resisor is 7.2-3.3 = 3.9V. The value of this resistor is thus equal to 3.9V/20mA = 195 ohm. Say 200 ohm. The power dissipated in the resistor is (20mA)^2 x 200 ohm = 0.08W. So, a 1/4W resistor more than enough.

You may consider connecting 2 LEDs and a 47 ohm 1/4W resistor in serious to the 7.2V source.

原帖由 艾力 於 2006-9-2 11:44 發表


白led，通常都係3V~3.3V，CURRENT 20A左加都好光架啦

20A ? 線都溶啦 !

原帖由 觀星是答案 於 2006-9-2 18:59 發表

20A ? 線都溶啦 !

I think it was a typo. He might want to say 20mA.

請問各位師兄,
我向鴨記華輝買唔到4001B CMOS IC, 只有4002B / 4003B,
唔知可唔可以代用??
THX.

原帖由 fyin 於 2006-9-5 14:27 發表
請問各位師兄,
我向鴨記華輝買唔到4001B CMOS IC, 只有4002B / 4003B,
唔知可唔可以代用??
THX.

4002B 都得
4001B 同 4002B 都係 NOR Gate
不過 Input 數目不同

4001B 2 inputs 1 output (4 sets)
4002B 4 inputs 1 output (2 sets)

線 o既駁法不同
4001B
1 NOR 2 =3
5 NOR 6 = 4
8 NOR 9 = 10
12 NOR 13 = 11


4002B
2 NOR 3 NOR 4 NOR 5 = 1
9 NOR 10 NOR 11 NOR 12 = 13

input 腳 short 晒佢 (同一個 gate 內唔可以有空腳) 由 motor 俾 singal , output 就去 LED

師兄,
謝謝解說, 但唔係好明線位點駁.
可唔可以劃份草圖給大家, 等大家有多個選擇喇.
thx again.

Please tell me what is coil connector....I've all those article in this subject but hard to understand the theory of brake light...

原帖由 TT-01 於 2006-9-6 12:22 發表
Please tell me what is coil connector....I've all those article in this subject but hard to understand the theory of brake light...

Coil connector 即係粒 relay 的 coil 腳 (通常都係 2 隻腳的)

原帖由 fyin 於 2006-9-6 01:16 發表
師兄,
謝謝解說, 但唔係好明線位點駁.
可唔可以劃份草圖給大家, 等大家有多個選擇喇.
thx again.

同下圖差唔多
不過 4002B 係 2,3,4,5 腳 short 埋駁 motor (-)
1 腳出 LED (Front)

9,10,11,12 腳 short 埋, 駁 motor (+)
13 腳出 LED (Rear)

Thanks youmy dear brother....
With love

師兄,
明白了, Thanks a lot!

小弟跟住樓主做o左個demo..... 大家一齊研究o下.... 唔好都唔好插呀

原帖由 lewislee 於 2006-9-7 00:31 發表
小弟跟住樓主做o左個demo..... 大家一齊研究o下.... 唔好都唔好插呀

會唔會係 ... 掉轉 o左開同關呢 ?