gary's p1 circuit

[chemelec]

Either 2 or 4 Diodes is Ok.
This is just how I did it on my original proto and never changed it.

[6666]

Thanks Gary.

[mohammadreza1100]

Be aware the original schematic have some intentionally mistakes.

[chemelec]

Be aware the original schematic have some intentionally mistakes.

Not on the "ORIGIONAL" Schematics I Send Out.

[nonkapo]

Hi Gary,
Just curious is there any particular reason why you do not use 556 instead? That will probably reduce the size of the PCB. Also have you ever try it with the CMOS 555's? Thinking of doing these my self but better to check with you first if there are any shortcomings(schematic specifics lets say interference etc)? Or it is just the component price or avaiability?
Thanks.

[chemelec]

Mostly I like the Normal 555's best. PERSONAL PREFERENCE.
I tend to buy all parts in hundred lots, and I Already have Far too many different Parts in stock, don't need to add more.
And Considering the overall current draw on a PI Detector, The small amount of Current Saving by using the CMOS ones, is Not very much.
At one time I did up a design with the 556's, but it really didn't change the PCB size by much.

Want a Smaller PCB, I could do one up with all SMT Parts, But My Eye Sight isn't up to Soldering them.+

And SOON to Completely QUIT this electronics.

[kt315]

But My Eye Sight isn't up to Soldering them
---

look https://www.ebay.co.uk/itm/292341008591
bought it. good.

[chemelec]

But My Eye Sight isn't up to Soldering them
---

look https://www.ebay.co.uk/itm/292341008591
bought it. good.

As I also Said, I Already have TOO MANY PARTS.
Last thing I need is Thousands More.

What I have will Soon go in the Garbage.

[nonkapo]

Thanks for the info. Sounds like my father.After all these years in the electronics he do nont like to see them any more.
KT thanks for the advise. I was looking at one to buy as the budget is not there for a microscope. Very handy item especially for smd.

[bernte_one]

Hi Gary, if you deside to end you electronic carreer could you please puplish all your shematics?

[chemelec]

Hi Gary, if you deside to end you electronic carreer could you please puplish all your shematics?

What do you mean by PUBLISH them?
Publish them to where?

ALL Schematics (1000 or so) or just my detectors?
I don't think I could do that, besides detectors are OLD Technology.

Probably Much better out there today.

[kt315]

Publish them to where?
---
in electronics for dummies

[chemelec]

Publish them to where?
---
in electronics for dummies

No I don't think so.

[kt315]

Want a Smaller PCB, I could do one up with all SMT Parts, But My Eye Sight isn't up to Soldering them.+
---
good baby for you new pcb amigo.
https://www.aliexpress.com/store/pro...ceBeautifyAB=0

[bernte_one]

Publish them to where?
---
in electronics for dummies

after building most Projects from first edt. it´s no fun, lot of things good complained but the Projects itself are a fail
too much what can go wrong