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AMZ Simple Tips Collection
Common transistors - A drawing of some common transistor types and their pin designations. I keep this one pinned to the shelf above my soldering iron. New 1 Jun 2002
DPDT switch - A diagram on how to wire a dpdt footswitch for true bypass New 1 Apr 2002
Breadboarding? - If you are working with one of the solderless breadboards like they sell at Radio Shack, be aware that it has a lot inherent capacitance that can often make a circuit behave in a manner totally different than when it is put on a pcb. High gain and high impedances are sources of trouble with these plug-in boards. Watch out for it! New 29 Mar 2002
Acoustic Guitar Microphone - Try the Radio Shack lapel mic (part no. 33-3013) inside your guitar; move it around to find the best placement. You'll be surprized at the sound from this $25 microphone! New 1 Jan 2002
VERY carefully hot melt glue the ECM capsule to the bottom of a soundhole mounted magnetic
pickup at the edge that faces the bridge. I used a S.Duncan Woody.
While the glue is still pliable, angle the ECM capsule so that it will point toward the bass
side lower bout of the guitar. Mix the two signals with an active mixer & tweak with the
mixer's channel EQ's. You wont believe the incredibly NATURAL sound that comes trough a
QUALITY S.R. system. Yes Virginia, this setup will still sound like crap through a regular
lo-fi guitar amp.
2 tips:
Seems that Seymour sells an "conceptually identical" product for a MSRP of around $300!!!!
What I described can be yours for less than $100...even if you pay full bore retail.
ENJOY!!!!!!
Wah Inductor Sub - FYI, I measured the inductance of the 1k:8 Radio Shack transformer that is recommended as a sub for the 500mH wah choke and found the primary to measure 530mH, which is a little high but still useable. It will make the center frequency of the filter slightly different than with a real wah inductor.
Here are some inductance mesaurements for some of the small Mouser transformers that might be useful in filter circuits:
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