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Beginner Problems / Reading a Schematic / Female Jacks
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Old 9th September 2019, 02:02 PM   #1
Jonague is offline Jonague
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Default Beginner Problems / Reading a Schematic / Female Jacks

Hey everybody!

Wassup? Here are a couple of beginner questions, which I hope some of you experts might help with.

I'm making a Marshall Guv'nor in accordance to a schematic found on Experimentalists Anonymous : https://www.experimentalistsanonymou...l%20Guvnor.gif

And have the following problems : First, the input appears, to my beginner mind, to be a stereo jack entry... Is that true? I'm assuming, unless using a Guv'nor requires a specific jack chord [which sounds a little unsettling], that my mono jack chord won't interact correctly with the stereo jack entry? Correct? I've googled something along the lines of "jack entry schematic symbols" to try to find out what the differences are between different symbols for jacks, and have found nothing but confusing information. It appears to me that on the Guv'nor Schematic, there are two electric paths beside the one that goes to ground. Can anyone help with that? Does that mean I have to buy a stereo entry? A stereo jack chord? Does that mean something else? Thank you.

Second of all, very relatedly, a jack entry [female jack] on the schematic for the "loop" entry has a little arrow drawn into it! Now what does that mean? I'm assuming contact is meant to be kept while no jack is plugged into this entry [the loop circuit is optional]. Is that correct? Does that require a specific socket?

Furthermore, I've been doing unsuccessful tests with this guitar pedal circuit, and am wondering why they have been unsuccessful. Now, just to make things a little harder for everyone, my very limited budget means I do not detain much troubleshooting equipment (multimeter, etc.). So, I can get very lost as soon as things don't go well : troubleshooting has always been very difficult with pretty much everything I've done. I'm assuming that if there's something I got wrong with those jack entries mentioned above, that may answer the problem. However, a part of me does believe it to be wise to ask the following questions : is there any reason that kicking out the EQ circuit [bottom right of the schematic] might make the entire circuit not work? Or kicking out the variable resistors [to replace them with nothing at all]? My simple representation of electronics tells me that this should not alter the functioning of the diagram, but, making this kind of deduction whilst knowing nothing of electronics is sometimes a starting point to f***in' everything up. Obviously, I've also kicked out the loop entry, supposing I should have, with the mentioned configuration, a Guv'nor with max gain, max volume, max Highs, Lows and Mids, and no additional effect, before moving on to adding these.

If anyone sees this and has an altruistic minute to spare, I'll take it no problem!
May the force be with you!
Jonah. (aka "Jonague")
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Old 9th September 2019, 02:38 PM   #2
Mooly is offline Mooly  United Kingdom
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Beginner Problems / Reading a Schematic / Female Jacks

The input jack is arranged so that it grounds the battery negative when a plug is inserted. That will power the unit on. You could use an ordinary mono input socket and have a separate power switch if you wish.

It is however drawn as a stereo type and so the mono plug (your lead) that you fit would short out the inner connection to ground and turn the thing on.

Output is just a mono socket.

DC adaptor (you've no need to fit this unless you intend using a separate adaptor) is just a mono socket that has the ability to link from one side of the socket to the other. When you insert the plug it opens the connection and the adaptor takes over. Such sockets are common and typically would have four connection tags, two on each side and with an obvious ability to switch as the plug is fitted.

I would say 'loop' is a similar type of socket but this time stereo (so 6 terminals, 3 on each side). You link L and R on the switched side and so there is a 'short' between those two points. Insert and plug and the short is broken and the plug connections take over.

The electronics I can tell you anything you want to know regarding voltages and what to expect. One quick check is to confirm that half the supply voltage is present on all opamp pins excluding the two supply pins.
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Old 10th September 2019, 01:51 AM   #3
PRR is offline PRR  United States
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> my mono jack chord won't interact correctly with the stereo jack entry?

Don't think. Many guitarists are technically clueless, especially when the gig is about to start, so the gear has to be designed to work without thinking.

This is a cheap "improper" trick used on MANY guitar pedals. When you stick a mono plug in a stereo jack, the Ring finger is shorted to Shell (ground). When you wire the battery to this, the power is on when a plug is in, off when the plug is removed. This is cheaper and more memorable than a switch.

FWIW, these days a DC wart is more common than actual batteries. It has become common to have a dozen pedals on the pedalboard, often semi-firmly attached, so battery upkeep becomes overwhelming.

> reason that kicking out the EQ circuit ..might make the entire circuit not work?

Sorry, you have to draw a picture what you "kick out". Yes, it is possible to remove part of a plan but, like my surgery, or a mystery a friend is writing, you have to stitch the loose-ends properly.

Mooly has said the same theory-details his own way. And I don't usually tout one forum on another. But *this* type question (a specific popular pedal and only a smatter of tools/theory) is well-handled at DIYstompboxes.com - Index There's even a Debugging thread specifically adapted to pedal-work.
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Old 10th September 2019, 10:05 AM   #4
Jonague is offline Jonague
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Thanked you both be for your answers!
I will explore accordingly and shall not hesistate to sollicitate this forum once again in case of need.
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Old 14th September 2019, 07:46 PM   #5
CapnDenny1 is offline CapnDenny1  United States
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Just for the record, jacks are always female. Plugs are always male. Just remember p stands for peni-nsula, or some other similar sounding word, which is clearly male like. To say female jack is being redundant redundant.
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Old 14th September 2019, 09:10 PM   #6
Enzo is offline Enzo  United States
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Capn, that confused me for awhile, but in other parts of the world, jack means connector. SO they use terms like "jack plug" and "Jack socket".
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