2n3565

H

Hercan Robotics

New Member

• Dec 18, 2006

• #1

Is there an equivalent for the 2N3565 Transistor?

 

audioguru

Well-Known Member

Most Helpful Member

• Dec 18, 2006

• #2

Are you making the Simple Lie Detector project? It works with any little NPN transistor: 2N2222, 2N3904 or BC547 pops into my mind.

Make it with a 9V battery:

 

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• lie_mod_208.png

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H

Hercan Robotics

New Member

• Dec 18, 2006

• #3

Cant find a 3K resistor can i use something else?

 

audioguru

Well-Known Member

Most Helpful Member

• Dec 18, 2006

• #4

3k is a standard 5% resistor value. Two 1.5k resistors in series makes 3k. A 1.2k and a 1.8k in series makes 3k, and many other series and parallel combinations.
But that simple circuit will also work with 3.3k resistors.

 

Nigel Goodwin

Super Moderator

Most Helpful Member

• Dec 19, 2006

• #5

audioguru said:

3k is a standard 5% resistor value.

Click to expand...

Depends on your definition of 'standard', it's NOT a standard E12 value.

 

Hero999

Banned

• Dec 19, 2006

• #6

No, it's an E24 value.
https://www.pc-control.co.uk/resistor-eia.htm

 

Nigel Goodwin

Super Moderator

Most Helpful Member

• Dec 19, 2006

• #7

Hero999 said:

No, it's an E24 value.

Click to expand...

I know!

 

audioguru

Well-Known Member

Most Helpful Member

• Dec 19, 2006

• #8

I haven't used resistors with a silver tolerance band since "carbon composition" days. Everywhere I shop for 5% resistors has the entire E24 values.

 

Hero999

Banned

• Dec 19, 2006

• #9

Most hobyists don't bother to stock the entire E24 series. E12 values are so much more common and you can buy 1% tolletence resistors in kits containing E12 values.

I have an E12 series set of 1% tollerence metal film resistors from 10hm: to 1Mhm:, plus many more of the E6 values from 1hm: to 10Mhm: and even more of the E3 series; all are 1% tollerence metal film.

 

H

Hercan Robotics

New Member

• Dec 19, 2006

• #10

I know this is the wrong place to post but I have built the lie detector circut and the needle on the meter goes the wrong way( past zero). Do I have somthing backwards?

 

audioguru

Well-Known Member

Most Helpful Member

• Dec 19, 2006

• #11

I think it is normal for that stupid simple circuit to show the meter needle pointing backwards when the probes aren't connected to anything so the transistor is turned off. With skin between the probes the meter should show near zero and you can adjust the pot for zero. Short the probes or have sweating skin and the needle will move forward.

 

H

Hercan Robotics

New Member

• Dec 19, 2006

• #12

Shorting the probs or toching the probs does not make any change.

 

H

Hercan Robotics

New Member

• Dec 19, 2006

• #13

Could I have the meter backwards.

 

audioguru

Well-Known Member

Most Helpful Member

• Dec 19, 2006

• #14

I hear an echo. Are you Robdude on Aaron's forum?
You fried your transistor by using it to short your batteries before.

 

H

Hercan Robotics

New Member

• Dec 19, 2006

• #15

Yes I am Robdude. I was just trying to get the quickest reply. Alright ill replace the transistor and see what happens.

 

H

Hercan Robotics

New Member

• Dec 19, 2006

• #16

Ok I replaced the transistor and its doing the same thing. Could the transistor be backwards? What about the meter? Can I send a pic how?

 

audioguru

Well-Known Member

Most Helpful Member

• Dec 19, 2006

• #17

During your reply here, click on Manage Attachments. Then click on Browse and double click on your pic or schematic. Then click on Upload. Then Submit Reply.

 

H

Hercan Robotics

New Member

• Dec 19, 2006

• #18

ok here are the pics.

 

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H

Hercan Robotics

New Member

• Dec 19, 2006

• #19

the LED on the right is just a power indicator circut for my breadboard.

 

Last edited: Dec 19, 2006

audioguru

Well-Known Member

Most Helpful Member

• Dec 20, 2006

• #20

I can't see where the battery wires are connected and can't see which connects to what.
Look at the datasheet for the 2N3904 to see its pins.

 

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