Pnp Darlington tube cannot be driven

冰魄3009

Pnp Darlington tube cannot be driven [Copy link]

 

The bd682 pnp Darlington tube cannot be driven. A 1k resistor is connected in series with the B pole, the E pole is 5V, and there is no output voltage at the C pole?

maychang

"A 1k resistor is connected to the B terminal, 5V is connected to the E terminal, and there is no output voltage at the C terminal?" A resistor is connected to the base terminal. Where is the resistor connected? It won't be floating, right?

maychang

In addition, what does it mean that the collector has no output voltage? There must be voltage at some point in the circuit, even if it is zero.

童心老叟

Unclear question

冰魄3009

maychang published on 2019-1-23 12:44 "A 1k resistor is connected to the B pole, 5V is connected to the E pole, and there is no output voltage at the C pole?" A resistor is connected to the base pole, where is the resistor connected? It won't be floating, right?

The base resistor is connected to the ground. The output voltage of the C pole to the ground of other SS8550 2N3906 type tubes is about 4.9V, but the BD682 tube is not like this. The output voltage to the ground is less than 1V, almost 0.

maychang

Bingpo3009 Published on 2019-1-24 09:11 The base resistor is connected to the ground. The output voltage of the C pole of other ss8550 2n3906 type tubes to the ground is about 4.9V, but the bd682 tube is not the same. To the ground...

Post the electrical schematic diagram and clearly mark the component values and device models. Without the electrical schematic diagram, it is impossible to explain clearly.

冰魄3009

maychang posted on 2019-1-24 09:34 Please post the schematic diagram and clearly mark the component values and device models. Without the schematic diagram, it is impossible to explain clearly.

The pnp Darlington tube has not been turned on

轩辕默殇

What I want to ask is why do you use it this way?

maychang

Bingpo3009 Published on 2019-1-24 09:52 The pnp Darlington tube has not been turned on

The pin arrangement order of BD682 is different from that of SS8550 or 2N3906. The collector is in the middle. Is the wrong pin connected?

冰魄3009

maychang posted on 2019-1-24 10:46 The pin arrangement order of BD682 is different from that of SS8550 or 2N3906. The collector is in the middle. Is the pin connected wrong?

Because of the electronic material from Taobao, the new 682 can