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Hi Quality Balanced PRO TRANSFORMER BASED INPUT MODULE (Ex Broadcast Industry)

$25.00
SKU:
CHKGUM7449
Condition:
Used
Minimum Purchase:
1 unit
Maximum Purchase:
6 units
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Oh Dear! This item has been sold but take a look around for other similar items

1980's Australian designed, manufactured

Ex Broadcast Industry audio input module

 

Great for re-purposing where a high quality, balanced audio input module may be required OR simply remove the very nice audio transformer and use alone.

 

Balanced Audio Input Module

Single Channel

Dates from the late 1980's period

Module uses a SINGLE rail supply of 24V DC

Input is balanced

Output is balanced

Active device is NE5534

PCB mounted trimpot allows for gain adjustment (feedback loop)

Module measures: 78mm length x 46mm wide x 36mm height

Weight (mainly the transformer) is 75g

 

CONDITION:

Excellent

NO damage to any component

"Tails" have been left which enable easy identification of the connections

Black - Red - Green = audio balanced

Orange - Black = 24V DC input

 

TECHNICAL NOTES:

THE TRANSFORMER

Designed and manufactured by Harbuch Electronics located here in Sydney. This company designs and manufacturers very high quality transformer based products and many of their components can be found in broadcast equipment of this era.

I used to supply Siemens ferrite products to Harbuch in the 1980's but I don't know what they are up to these days, they appear to have moved from Hornsby to Artarmon. The website now is pretty "flakey" - it looks like a "work in progress" you can try having a look yourself HERE

On their website it does state:

"Individual data sheets are available for each transformer type listed in this guide. These sheets have a photo and mechanical drawing, response, THD and phase plot, specification panels and an oscilloscope photo of the response to a 2kHz square wave at a level just below maxium rated output or input."

So according to that info, a phone call may glean more technical information that could be required

 

The circular can style casing is Mu metal.

Can size: 31mm diameter x 31mm height

The base has a screw thread with nut to secure it to the board and should be connected to ground

The leads (5) all exit the transformer can from the underneath, these are colour coded stranded wire leads NOT PCB pins

Specifications are difficult to come by these days but I can assure anyone interested of the following:

Frequency response is to AT LEAST 15KHz - this is normal for broadcast audio equipment

Turns ratio 1:5 (200 Ohm to 5K) REFERENCE

If access to this link is difficult (as happened for me) it really seems to be a bit flakey at the moment, further evidenced by there being NO photographs at all

 

THE AMPLIFIER

Based on the common NE5534 high performance Op amp and it appears to be configured as a voltage follower/buffer amplifier.

Trimpot adjusts the amount of output signal being fed back to the inverting input (feedback loop)

Single rail supply, 24V @ pins 4 & 7

 

TESTING

Prior to removal from the original audio equipment, this module has been tested and is working fine

Tested as described in the description This item is not returnable