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Ross565

Crown GLM 100 Bi Polar phantom supply

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Hi Support team

I use a number of GLM 100E capsules wired for Wireless body packs ( Shure 4 Pin TQ connectors )

To increase flexibility in use I would like guidance in assembling a phantom power

interface box to enable cabled operation from phantom power.

I have seen the schematic for " phantom powering circuit for a GLM - 200E "

using a 3:1 or 4:1 transformer but would like to power the capsule using a bi polar

arrangement to allow for for maximum possible headroom.

I have been considering a 4:1 Jensen transformer

I would welcome any schematic guidance.

Regards

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Hi,

I attached a schematic that shows two ways to bipolar-power the GLM-100E.

It's a bitmap file that opens in Microsoft Paint.

Brubart

2683[/snapback]

Excellent thanks for your help

FYI Jensen reccomend a transformer for this application that other companies are using with success. It is Jensen Transformer model JT-10KB-D

NB NOrmally used a 4:1 transformer for line inputs.

As it does not have centre tap sec. I assume we can use 2x27K resistors( instead of the one from the tap in the schematic) to form a virtual tap at the junction of the two resistors e.g a similar circuit configuration ( with different component values ) as used in the PZM-30D electronics ?

Thanks also for such a great range of products

Regards

Ross Mullins

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...

As it does not have centre tap sec. I assume we can use 2x27K resistors( instead of the one from the tap in the schematic) to form a virtual tap at the junction of the two resistors e.g a similar circuit configuration ( with different component values ) as used in the PZM-30D electronics ?

Yes, using two 27K resistors to form a virtual tap will work.

brubart

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