Jeez, Colin, what's the heat output like?

Another new build by Ben.

What does that sell for Colin?

Noel of Hi-Fi World has asked for details on the three amps "The Kit SECA" the "Super SECA" and the "100W A Class" for a maybe review and opinion.

The 100W has got a few people tapping there feet, and hell it goes loud.

What's your estimated cost of build for this one, Colin?

Not bad at all.

cpc.farnell.com/multicomp/lpr35v229m35x45/capacitor-22000uf-35v/dp/CA04832?aa=true&ost=22000uf&selectedCategoryId=&categoryId=700000011525

If using the PSU PCB the 33,000uf can be replaced with these. 22,000uF

The Relay is now not needed so do not fit.

Today I started building to more of Collins amplifiers, I am planning to build two of his Seca DIY Amps as I plan to run my speakers actively. I playing to step three amplifiers on top of each other , so of course I will have to call the three amplifiers the Wonfor Tower of Power

Hi Philip, Are going to use a reg?
The max power is about 90W a Power amp on the large heat sinks we have used.

                                                                                Max Out Volts
90W Disipation         IQ          Volts neg         Volts pos         8 Ohm
        90                4.50              10                  10              7.07
        90                4.09              11                  11              7.78
        90                3.75              12                  12              8.48
        90                3.46              13                  13              9.19
        90                3.21              14                  14              9.90
        90                3.00              15                  15             10.61
        90                2.81              16                  16             11.31
        90                2.65              17                  17             12.02            
        90                2.50              18                  18             12.73
        90                2.37              19                  19             13.43
        90                2.25              20                  20             14.14
        90                2.14              21                  21             14.85
        90                2.05              22                  22             15.55
        90                1.96              23                  23             16.26
        90                1.88              24                  24             16.97

Ok Philip have a look Volts neg and pos is you PSU on the amp board, The IQ is the current setting. Max Out Volts is the power i.e. (10.61 * 10.61)/8 = 14W now this only works if the current and volts are set. For example 7.07V will not give us much load current into 8 Ohms using V/R =I we get 7.07/8 =0.88W so choosing the correct voltage is a interesting task.

I would suggest choose a IQ then the voltage(DC) best result seems to be about 2.3A - 2.5A i.e taken 2.4A and  a Out Volts of 12V we get best load line as 12/2.4 = 5 Ohms and 28W. with a PSU +18 - 19v,- 18 - 19v DC this approx relates to a transformer  15V-0,15V-0,  but if you regulate then you must allow for the min volt drop across the reg i.e. 3 - 7V, then the heat has also got to be dealt with 2.4*3 = aprrox 7W for each power reg i.e. 14W.

I hope that helps a bit, if not please ask.