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NTE-4 audio transformer
NTE-4 audio transformer
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Old 13th January 2019, 04:24 PM   #1
warmbells is offline warmbells
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Default NTE-4 audio transformer

I want to match a piezo transducer to an audio amp to use as a pickup. I have gotten hold of a NTE-4 audio transformer but cannot find out which colours of wire will connect to the transducer. Any ideas?

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Old 13th January 2019, 11:42 PM   #2
PRR is offline PRR  United States
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NTE-4 audio transformer
Generally, a piezo is a poor fit for a transformer.

Have you tried just connecting the piezo to your input?
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Old 15th January 2019, 01:49 AM   #3
Gnobuddy is offline Gnobuddy  Canada
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I agree with PRR about the unsuitability of a transformer. (The trouble is, the impedance the piezo wants to see is far higher than you can get out of any reasonable transformer.)

Try connecting the piezo straight to the amp input. If that produces thin or missing bass, try wiring a small capacitor in parallel with the piezo. That may seem like madness, but it actually works very well because of the nature of the piezo (itself a capacitive source).

By "small capacitor", I mean anything from 0.01uF to 0.1 uF or so. The bigger the cap, the smaller the voltage arriving at the amp input, so don't use a capacitor bigger than necessary to bring up the bass.

If you know the input impedance of the amp in question, I can give you a better estimate of the proper cap value to try.

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