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Crown GLM 100 Bi Polar phantom supply


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#1 Ross565

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Posted 26 January 2006 - 11:21 PM

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

#2 brubart

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Posted 01 February 2006 - 03:15 PM

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

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#3 Ross565

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Posted 07 February 2006 - 11:18 PM

QUOTE(brubart @ Feb 1 2006, 04:15 PM)
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
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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

#4 brubart

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Posted 16 February 2006 - 01:06 PM

QUOTE(Ross565 @ Feb 7 2006, 11:18 PM)
...
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