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Watched that earlier this morning. Thanks Jules I saw that JLi are now stocking piezo cylinders. If anyone in the UK, is on the lookout for them, I'd be happy to do a group buy as the shipping on

Digression on wireless beltpack connectors... The Shure TA4F (aka mini-XLR) wiring scheme is pretty clever - you can wire it for different topologies as the audio and power pins are separate. The 20k

I updated my hydrophone instructables with a new one. The biggest change is input protection for the OPA1642 high impedance buffer with a pair of Schottky diodes. I stress tested this big time after

Bamboo, like elephant grass(miscanthus), has a very high silica content, 10x higher than barley straw and 5x – 10x higher than rice straw on a dry matter basis. This blunts tools very quickly.

Update on the FET: I removed the capsule from another one and it's marked "IA". I believe it's a Toshiba TTK101MFV, datasheet states it's for "compact ECM" and the equivalent diagram shows a bias

The effect of R1 on the bias point is indeed negligible compared to the 20k source resistor load. I think R1 is there to avoid ringing or even parasitic oscillations caused by the capacitive load of

Thanks for the answers! The the Shure bodypacks have a 20KOhm bias resistor to ground where I wrote “BODYPACK_20K_BIAS_AND_AUDIO”. What difference does 100Ohms make? It’s a 0.5% difference,

R1 is to bias the Fet properly. Also there is no 1G resistor as that Fet has an internal diode designed to “leak” current and somewhat act as the 1G resistor. Most electrets with built in FETs

It's sometimes called electrostatic guard. A very common technique in RF and very high impedance circuits. The parasitic capacitance is used profitably to bootstrap the gate. It shields the gate as

When cell phones became common, Shure lavalier microphones were picking up GSM noise. Shure changed their FET circuit, added a dot on the lavs so you'd know they're the new type and marketed them as

Ha! This is some interesting stuff! I didn't know bamboo can be so hard it requires metalworking tools. Great reading, thanks for interesting and extensive information :) Didn't know your pole

I opted for the felt-covered version in the hope that they would be slightly better at rejecting dust etc in the field. Also, they were a few cents cheaper. I recall seeing SONY and other pro lavalier

You are right. Many bamboo species are light. It depends on the type of bamboo. This is a so-called Moso bamboo (Phyllostachys edulis). The pole with the headphone is dry, hollowed and about 5 feet in

Heinz - what a splendid setup! :) Bamboo too heavy?? Seriously? It's empty inside. Or is there something I don't know? Compared to my head it should weight next to nothing :) Mine's probably around 2

Thanks for your kind feedback! I tried something similar with the Victor HM-200 Binaural Microphone Headphone. But it turned out that the bamboo is much too heavy to carry it around. Anyway, it was

Yup! One's portable binaural tree ? BTW your (lovely) bamboo housings prompted me to move my lazy ass and finally make this True Tree Ears version. Beforehand I just fastened home-brewed lavaliers

Vladimir - I also got the same version: no felt, perforated front (from TME in Poland, much lower shipping than from Mouser). Official PUI datasheets of both versions show no differences.

Oh. would you please tell a bit more about 'fun stuff' you mentioned. It is interesting.

So cool! One should start a true binaural forest soundscape project. :-) Which reminds me to continue my bamboo microphone housings. Many thanks for sharing! Heinz

The one gig is pretty much “industry standard”. The capsule capacitance swamps the LF noise it can generate. You could easily go to 2G at 10G you can run into humidity issues and other fun stuff.