I have one that I bought 2nd hand without the original mic assembly it came/comes with. I don't have a schematic so I don't have the info needed to make my own assembly from the electret capsules I have sitting around. I see from pics that the plug from the mic assembly going into the pedal is a mini-TRS type. However, probing around does not reveal if the additional contact is to somehow carry signal from the second mic capsule, or to provide DC power from the pedal to the two mic capsules. And, if the latter, which contact is carrying the DC power and which the signal?
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Anybody know anything about the Danelectro Free Speech pedal?
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Originally posted by Mark Hammer View PostI have one that I bought 2nd hand without the original mic assembly it came/comes with. I don't have a schematic so I don't have the info needed to make my own assembly from the electret capsules I have sitting around. I see from pics that the plug from the mic assembly going into the pedal is a mini-TRS type. However, probing around does not reveal if the additional contact is to somehow carry signal from the second mic capsule, or to provide DC power from the pedal to the two mic capsules. And, if the latter, which contact is carrying the DC power and which the signal?
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Originally posted by Mark Hammer View PostThanks. Much appreciated. Take your time. I'm in no hurry.
The two mikes are connected by two separate shielded cables to the 3.5mm TRS plug. Each mike connects to the plug separately, one to the tip and the other to the ring. They share a common ground connected to the shield.
The circuit provides 4.5 vdc to each mike, which I assume is the bias voltage to the single supply TL072 op amp that connects to the mikes.
Hope this helps, let me know if there is anything else you need to know.
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More confused than ever, now. For 3 contact capsules (V+, gnd, out), it's not clear how they should be connected. I've tried several different two-contact capsules, assuming that the DC-blocking cap on the output, and current-limiting resistance feeding V+, are both provided internal to the pedal. No dice.
I've sent a note to Danelectro, requesting either a schematic or some clarification. As the great orange one says: We'll see what happens.
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I'll take a guess. Remember the 2-wire mics have an internal FET so they are polarity sensitive.
Can you post a few closeup photos of the boards, both sides?
https://music-electronics-forum.com/...1&d=1584043921
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Problem solved! The pedal was being operated by an idiot.
Because the onboard speaker functions like a mini-amp, I naively assumed that I would hear something from the speaker, if I blew into the mic while it was in effect mode. It just dawned on me that maybe one only hears what the mic picks up at the output of the pedal. I finally plugged in a patch cord between the pedal and my amp, and lo and behold, sound!
Excuse me while I smack my forehead a few hundred times.
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