15W kit schematic errors!

[N9VOC]

While blundering through some sources on the internet, I ran across Qkits out of Ontario Canada. They distribute the "Futurekit" line, out of southeast Asia.

I ordered two of the FK607 units, listed as 15 watt amplifier stages. they are based upon the TDA2005 chip, and I am quite pleased with the quality and ease of assembly, it comes with what I would consider an excellent heatsink, and the little circuit boards will become the power stage of a twin 15 watt amplifier I am building.

HOWEVER, the schematic included with the kit is wrong! With this post, I have attached a pdf of the original schematic (redrawn for clarity, with the errors as published.) I will attach a pdf of the corrected schematic on the following post

[N9VOC]

I have attached of pdf of the corrected schematic for the FK607 assembly - borne out by tracing the circuit paths on the circuit board.

Future kit claims in this configuraqtion, the voltage gain is 30. In my next post, I will show the pdf that includes the modifications I made to the circuit, which boosted the gain to 40, and improved low end response.

[N9VOC]

Attached is a pdf of the FK607 15 watt solid state module that I ended up building, with the modifications I made to the circuit.

Specifically, I ran a wire rather than the 4.7 k "R1" in series with the input, and changed the 1.0 uF C5 input capacitor to 2.2 uF.

The circuit as modified has a voltage gain of 40.

I found the modules at Qkits.com

Just thought I'd throw this out there, I can use these modules and the "stereo" version in a current and some future projects stewing around in the back of my mind! ( I know, 15 watts isn't a LOT of power, but it is enough to suit my needs - and the price was good too!)

Cheers!

[N9VOC]

Sorry, folks, looking at the pdf's I see I left the value of one of the zobel network resistors out - they are both 1 ohm