LM4780 feedback

[littlerick]

Im thinking of getting one of the kits from AudioSector... anyone used the company before?

What else do I need to complete kit?

What are delivery times like?

[AndrewT]

the chassis, hardware and heatsink account for about 30% of the budget.
The PSU accounts for another ~30%.
The amplifier takes up a further ~30%.
Leaving 10% for bits and pieces you have forgotten.

Link to Audiosector?

[littlerick]

I am planning on a diy chassis... I have a Pioneer A-676 that I have stripped, got 2 heatsinks and a few knobs n swithes. Maybe even the PSU will be ok to use.

Its my first go at this sort of kit. I wanna make a good job of it if I can.

Working would be nice, working and looking good would be great.

[littlerick]

Sorry Forgot link...

DIY Chip Amplifier Kits, PCB's, Components and Information.

[peranders]

Originally Posted by littlerick

Im thinking of getting one of the kits from AudioSector... anyone used the company before?

I see that you are new here. Peter Daniel has been here from the start (yes?) more or less. I should guess you are one of the few which don't know anything about Audio Sector or DIY Chip Amplifier Kits, PCB's, Components and Information.

[littlerick]

Well I think I'm gonna go ahead n order it.. Im sure I will have many Help! posts when it arrives.

Im hoping to do a 3/4 transparent or smoked case with maybe a nice block of alloy as a front panel... Few LeDs to make it pretty.

So maybe if I screw the electrics I will do it in style!

[sangram]

I bought 5 of those and I'm very happy with them, was running them balanced for a long time as my main amp.

[littlerick]

OK I ordered the kit and cant wait to get going... I see the kit needs a 22+22V 300VA Transformer.. Will i need 1 or 2 to power the kit. I see some with only one fitted and some have two..

What is the difference?

If I cant get the 22v would I do better with a 25v as opposed to a 20v version?

Sorry for all the questions but I am new to the hobby.

[AndrewT]

one power amp can run from one 160VA to 300VA transformer.
Two power amps can run from one 160VA to 300VA transformer.

A pair of monoblocks will perform better than a two channel amplifier, even when you put two transformers inside the common chassis.

The transformer voltage is directly related to your output power target and the speaker impedance. Read the datasheet carefully.

[sangram]

25V transformer = 35VDC, good for 8 ohm speakers

22V transformer = 30VDC, good for 6-8 ohm speakers, fine even with 4 ohms but need a bit of heatsinking

20V transformer = 27VDC, good for 4-6 ohm speaker, usable even with 8 ohm speakers but with a little less output.

Each PSU board has connections for two windings. The windings can be off the same transformer or two separate ones. A 22+22V transformer would have two windings and be sufficient for the task. Choose upwards of 200VA per board to ensure you have some reserve.