A Little Help Please.

[DJ6ta]

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**

 

[PatM]

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

 

[mneary]

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

 

[Warpspeed]

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

 

[bychon]

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

 

[DJ6ta]

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]

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

JimB

 

[Reloadron]

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

 

[divemaster28]

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