BillFitzmaurice.info

Powerline piezo series were 2K Hz designs therefore the bigger sized element and longer path. Likely the cone on the powerline is heavier than cheap piezo but if same size some coats of lacquer may allow replacement of damaged powerline cone with cheap cone Will study patent 4864624 carefully. It is...

Hello Stu: Sometimes we must destroy prior to learning. So this is just like the original motorola patent 3786202 (check it out in Google patents) Felt or fiberglass? insulation material between the diaphragm and the piezo. Is it glued to the diaphragm or piezo or just floating in between the two? T...

Thanks mate!! So there is an initial layer covering and extending outside the perimeter of the actual crystal. What does this material feel like?? Should be rubber like. Then there is another layer on top of that one which seems to be perforated with large holes and provides one of the three point s...

Not interested in using powerline piezos too expensive for array use but certainly much can be learned from them. Their protection circuit allows parallel connections of all piezos with resulting greater SPL output AND still have overpower protection. Use of Motorola damping and suspension may mean ...

Brief research in the internet (not much available) powerline piezo used a PTC (thermistor) resistor which increases resistance as power is applied. At about 100 watts increased resistance shunts power to the parallel wired tungsten bulb which increases resistance as power increases and acts as a so...

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Can you show more details of the suspension and damping system on the powerline piezo and measure thermistor (heat sensitive resistor) Ohm values, and give wattage and details on the bulb. Apparently as power goes up the thermistor opens up and allows excess power to light up bulb acting as power li...

One interested primarily in SPL and extended freq response would be interested in the comparison between the CTS 1177 (double element) and a powerline tweet and then possibly a vertical array of each. Is the CTS or CPC 1177 equivalent twice as loud as a single element tweet?? Apparently the HF cance...