Question:
how to construct an electrical circuit from a schematic?
Random Gibberish
2009-08-13 18:24:30 UTC
i'm ready to take up a project. that is, making a guitar/bass distortion pedal. i've been searching all night and have found a tutorial that explains how to do it, but it requires a bit of prior knowledge, of which i have none.

i'm doing my best to look up how to actually construct the circuit, but its all a bit hazy to me. i have a schematic that and its meant to be on perf board. (barley know what that is) i just want to know what to do with the schematic. where to put wires, how to put them on. just how to transfer the schematic to actual circuit basically. i want to exagerate hoe little i know about electronics and stuff (but i am aware i need a soldering iron)

thank you in advance for helping me, and please assume i know nothing if and when you explain

Schematic: http://i291.photobucket.com/albums/ll288/heyzuphowsitgoin/Distortion1.jpg

Tutorial: http://www.instructables.com/id/Distortion_For_Cheap/?download=pdf
Four answers:
rathhial
2009-08-13 19:37:50 UTC
That is a very simple circuit built around an LM741 amplifier 8-pin chip. The small number of discrete components added to the chip via wiring makes the following addition to Goober's suggestion perhaps helpful:



Take 2 to 4 pieces of simple cardboard from the standard cardboard box (which we throw out in great numbers in the USA). Each piece should be at least 12 inches on a side. Use some Elmer's glue or double-sided tape and put them together to make a thick piece of cardboard. That's your "breadboard", which you called a "perf" board. Since it's cardboard, you can make holes in it VERY easily. If you really screw up ... it's just cardboard, and you can make another breadboard easily. Note well that it's still flammable; for the circuit power, it's generally not an issue, but you should not use such a breadboard for any circuit using anything more powerful, like that using power leads from a wall outlet (120v or 240v, depending on your country's standard).



Go get an 8-pin socket from Radio Shack or wherever. Now you solder the 5 wires (using generous lengths -- at least 24 inches each) that the diagram shows onto the 8-pin socket. You need to get SOME soldering skill, so have a friend show you how to do this. Watch him or her solder a couple of the socket's leads, then do the remaining yourself.



Plug the LM741 into the socket, and then punch 5 holes into the cardboard, and then thread the wires through.



Pull the wires until the socketed LM741 snugs up to the cardboard. Don't overdo it ... just a gentle snugging. Now, draw the circuit diagram onto that back of the cardboard with marker. If you make a mistake, don't worry ... just scribble it out and draw the correct lines. Now you can see why having such a large piece of cardboard is handy.



Space the components out roughly like the diagram does. For example, the input jack location should be as far as possible from the output jack.



Then wire up those components similarly; soldered to wire, wired through the cardboard, snugged. You will see that it makes sense to start joining existing wires from the back of the cardboard to the added components, so you'll fiddle with getting that done. But if not, you can just join wires together by twisting them, even soldering them together. Your soldering friend can show you how.



At the end of the project, you'll have this piece of cardboard with components flopping slightly on one side, and on the other side, a wiring diagram with all kinds of wires flopping around. Your soldering friend should have wrapped electrical tape around any exposed metal from the wires.



Having too much wire running everywhere might be a natural result for the amateur ... but don't worry, since you can always snip them down in length and then re-twist or re-solder them together. And shorter wire runs mean less chance for electrical interference, which is fairly important in audio circuits.



Note in the diagram you have 3 places with downward-pointing triangles. Those represent grounding. For the purposes of your home-made circuit, they can all be wired together.
guru
2009-08-13 19:11:48 UTC
This is a bit complex for a first project !

If you go on this page

http://search.digikey.com/scripts/DkSearch/dksus.dll?Cat=2359508&keywords=perf%20board

In circuit pattern, click on 4th line, 0.1 grid

Then a bit below there is a button apply filter click on that

Now there are only 172 items, click on view page

There is a bunch of part numbers, the first one 3405K-ND in blue click on that

There is a photo of that product

This is a perforated breadboard; it is used to mount the components.



I suggest you go to an electronic store and buy a kit, because it has all the parts and is something that works.

Maybe Radio Shack have some, but hobby stores are more likely to have something more appropriate

That schematic is just a crude thing, it will oscillateā€¦it is not a complete circuit diagram!

It is like making a jigsaw puzzle, to start with a 6000 piece thing it may (will be for a beginner) be discouraging!





Hope this properly answers your question





Guru
goober
2009-08-13 18:48:51 UTC
Create a layout for your circuit on paper. Put the input starting on one edge of the board and the output at the opposite edge. When using the perf board, the connections that show on the schematic occur at little metal inserts that you get at the same place that you get the perf board. Draw a dot where each insert will go that is far enough from the others to allow the components to be placed between the inserts. Try several layouts to get something that more or less flows from input to output. If you have to make lots of connections to one place you can use more than one insert and connect them together with wire.



The input connector, output connector, and any controls would be mounted on a the enclosure that will also house the completed perf board. In your layout allow spaces for mounting screws. You can mount the board to the enclosure by small self made brackets or tubes with screws through them.
?
2016-10-15 04:11:32 UTC
a million. it extremely is a ten:a million step down transformer. 2. N2 output voltage is 20Vp-p. 3. equivalent to twenty /2.8 = ~7volts RMS 4. a million/2 wave with capacitor out has top voltage = 7 X a million.4 = 10 v. DC YOU in no way waiting to GET 12 VOLTS DC.


This content was originally posted on Y! Answers, a Q&A website that shut down in 2021.
Loading...