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LM4780, Attenuator, Mic and preamp

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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.

An externally hosted image should be here but it was not working when we last tested it.


An externally hosted image should be here but it was not working when we last tested it.


£35 + P&P.

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Stepped Attenuator - 12 steps

An externally hosted image should be here but it was not working when we last tested it.


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.

An externally hosted image should be here but it was not working when we last tested it.


£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.

An externally hosted image should be here but it was not working when we last tested it.


An externally hosted image should be here but it was not working when we last tested it.


An externally hosted image should be here but it was not working when we last tested it.


£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:

An externally hosted image should be here but it was not working when we last tested it.

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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