Author Topic: Solderless breadboard question and perfboard question  (Read 7723 times)

gnort_2

Solderless breadboard question and perfboard question
« on: July 02, 2013, 06:48:44 PM »
Hi,

1. Just got all the parts I ordered in from mouser to build my npn booster.  I hooked them all up to a solderless breadboard to familiarize myself with all the various components.  When I plugged in my electric ukulele and my amp I got a loud hum.  When I strummed my uke however I could faintly hear its sound barely coming through the garbled hum.  I assume that loose connections and bare, unsoldered wires fed into the in and out jacks could be the culprit behind this scratchy hum.  So my next course of action I guess is to start building the pcb, and hope that the hum came from poor connections..  Does this seem like a logical next step?

2.  I noticed in the beginner project building tutorial that the back of the pcb had copper around each hole.  The perfboard I ordered from mouser had no such copper.  The holes are just holes.  The board seems to be made of Bakelite or another similar material.  Is it still ok to use?  What foreseeable problems could it cause?  Why is the copper backing needed or an advantage?



Thanks all

midwayfair

Re: Solderless breadboard question and perfboard question
« Reply #1 on: July 02, 2013, 06:53:00 PM »
1 sounds like a ground issue. Are both of your jacks grounded? You should get far more than a faint signal. It boosts a LOT.
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gnort_2

Re: Solderless breadboard question and perfboard question
« Reply #2 on: July 02, 2013, 07:10:20 PM »
Don't think I grounded it at all, I hooked the tip of the input jack to the input point of the board and the tip of the output jack to the output point of the board as described in the tutorial... How do I ground them?

deadastronaut

Re: Solderless breadboard question and perfboard question
« Reply #3 on: July 03, 2013, 05:05:04 AM »
you must have the 'sleeves' of the jacks connected to the ground on the board too, for it to work.

power negative for example..

now watch your levels.. ;)


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gnort_2

Re: Solderless breadboard question and perfboard question
« Reply #4 on: July 03, 2013, 12:17:19 PM »
you must have the 'sleeves' of the jacks connected to the ground on the board too, for it to work.

power negative for example..

now watch your levels.. ;)




a.)Watch levels?  How do I check those again?  You mean voltage levels i assume?

b.)Sheilded cable should be used for the final build when attaching to the input/output jacks i assume?

c.)when i got it working on the breadboard after grounding the jacks the potentiometer didnt seem to do much,  and there wasnt much boost,  diagnosis anyone?




What about my question "2" in my original post?  Will a perfboard with no copper around the perfs be ok to use?


Thanks for all the help guys,

mistahead

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Re: Solderless breadboard question and perfboard question
« Reply #5 on: July 03, 2013, 08:53:48 PM »
The copper conducts electricity - the brown is an insulator...

Does that answer your question "2"?

deadastronaut

Re: Solderless breadboard question and perfboard question
« Reply #6 on: July 04, 2013, 04:53:06 AM »
: i meant volume levels as its a boost.

which schematic/layout are you using?..pics?..link?.

pictures of your build might help with diagnosis.....

https://www.youtube.com/user/100roberthenry
https://deadastronaut.wixsite.com/effects

chasm reverb/tremshifter/faze filter/abductor II delay/timestream reverb/dreamtime delay/skinwalker hi gain dist/black triangle OD/ nano drums/space patrol fuzz//

duck_arse

Re: Solderless breadboard question and perfboard question
« Reply #7 on: July 04, 2013, 08:05:33 AM »
gnort, the very worst mistake you can make is to take a circuit not working on the breadboard, and solder it all up hoping to magik it to work. find out what, why and where before you even plug the iron in. we are here to help.

the copper around the perf holes provide mechanical anchor points, with the solder, for the component leads. with the copper will provide a more "rigid" build, but without will still work the same.

I never use perf, only vero. if I had the stuff, I'd use pcb's instead.

many of us, having used sheilded cable in the past, know just how much of a pain it is to use. use plain hook-up wire, and if the end result is a pig-squeeling mess, sheilded might be the answer.
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smallbearelec

Re: Solderless breadboard question and perfboard question
« Reply #8 on: July 04, 2013, 06:55:08 PM »
1.  loose connections and bare, unsoldered wires fed into the in and out jacks could be the culprit.

Yes, you Must solder. If you don't have the right tools, wait till you do. You may also have made a mistake in translating from the schem to connections on the breadboard. Someone really should do a breadboard layout of that project with lots of step-by-step pics to guide a beginner. The thing absolutely Will work if Everything is correct.

The progression that I show in these three articles is what I am talking about:

https://www.smallbearelec.com/HowTos/Breadboarding/BreadboardIntro.htm
https://www.smallbearelec.com/HowTos/BreadboardUrsaMinor/BreadboardUrsaMinor.htm
https://www.smallbearelec.com/Projects/UrsaMinor/UrsaMinor.htm

When you are starting out, even when breadboarding, look for vetted layouts and be very anal about doing Exactly what you are told. Compare carefully the physical connections you make with the schem and layout. The relationships will take hold, and you will be on your way to DIY madness.

Regards
Steve Daniels