A Little Help Please.

D

DJ6ta

New Member

• Apr 24, 2010

• #1

I have assembled this entire circuit except this one part. I have never seen this symbol before and I know its not a diode. So what is it?**broken link removed**

 

P

PatM

Member

• Apr 24, 2010

• #2

Looks like R1 could possibly be a potentiometer, and that is the wiper contact.

 

Last edited: Apr 24, 2010

M

mneary

New Member

• Apr 24, 2010

• #3

Where did you find the diagram? One of us may be able to interpret the description that they hopefully provided.

 

W

Warpspeed

Member

• Apr 24, 2010

• #4

Definitely a potentiometer, and it adjusts the operating frequency of your 555 timer.

 

bychon

New Member

• Apr 24, 2010

• #5

Problem....if R1 is ever 0 ohms, the chip smokes.

 

D

DJ6ta

New Member

• Apr 24, 2010

• #6

The R1 component is a potentiometer, but how does that sysmbol incorporate into the design? I have everything wired up except that and Im not sure how to proceed.

The link for the write up is as follows

**broken link removed**.

 

JimB

Super Moderator

Most Helpful Member

• Apr 24, 2010

• #7

My best guess is that it is a badly drawn potentiometer in a poorly designed circuit.

JimB

 

Reloadron

Well-Known Member

Most Helpful Member

• Apr 24, 2010

• #8

My guess is that it bears a strongly resembles the attached drawing taken from an old Forrest M. Mimms III circuits notebook Circa 1982. The part is a potentiometer and yes, the circuit originally posted is poorly drawn. The attached works fine. Sorry the original paper is yellowed.

Ron

 

Attachments

• 555 Pulse Generator.jpg

  126.9 KB · Views: 151

D

divemaster28

New Member

• Apr 25, 2010

• #9

Mabe that is the loop of the potentionmeter pin1 and 2 to gether.