LM4780, Attenuator, Mic and preamp - diyAudio
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Old 18th October 2006, 02:36 PM   #1
Vikash is offline Vikash  United Kingdom
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Default LM4780, Attenuator, Mic and preamp

These have been sitting on my worktop for over a year.

LM4780 amp. Needs little introdution. Never used, or tested even. But the PCB is populated and complete.

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Click the image to open in full size.

35 + P&P.

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Stepped Attenuator - 12 steps

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Built with quality Welwyn RC55 resistors.
Resistor Values:
1 - 0
2 - 100.2R
3 - 154.1R
4 - 226.2R
5 - 332R
6 - 464.4R
7 - 681.2R
8 - 1k0R
9 - 1K54R
10 - 2K74R
11 - 5K11R
12 - 12k08R

Used once for testing, but not enough steps for my liking.

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15 + P&P.

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Mic Wand fitted with Panasonic WM-61A electret and phono connector. Wired in reverse (ala Linkwitz mod).

Used condition.

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5 + P&P.

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Prototype preamp PCB
This is the protoype version of the mic preamp sold on madaboutsound.com, as seen here:

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Note it does not come withe above enclosure.

In used condition and needs some minor attention as it has no input RCA connector, or battery strap. Would be perfect for someone on a budget.

Output connector is RCA so would fit above mic wand perfectly.

10 + P&P.
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"The human mind is so constituted that it colours with its own previous conceptions any new notion that presents itself for acceptance." - J. Wilhelm. (But I still think mine sounds better than yours.)
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Old 18th October 2006, 05:28 PM   #2
Vikash is offline Vikash  United Kingdom
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LM4780 and stepped attenuator sold pending payment.

Mic preamp and Mic left.

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"The human mind is so constituted that it colours with its own previous conceptions any new notion that presents itself for acceptance." - J. Wilhelm. (But I still think mine sounds better than yours.)
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Old 18th October 2006, 06:19 PM   #3
AndrewT is online now AndrewT  Scotland
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Hi V,
you have Email
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regards Andrew T.
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Old 18th October 2006, 09:41 PM   #4
Vikash is offline Vikash  United Kingdom
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Mic and preamp sold pending payment.
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Old 19th October 2006, 11:14 AM   #5
Vikash is offline Vikash  United Kingdom
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Everything sold and dispatched. Thanks.
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Old 23rd October 2006, 10:43 AM   #6
vex0rg is offline vex0rg  Ireland
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Amp and Attenuator arrived safe this morning.

A pleasure and thanks


Gerry
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