Recently i posted the circuit i drawn on diyaudio. The people there are very friendly and they helped me out and pointed out to me that the way i implement my CCS would result in me having a very unstable bias. So they recommended me to change it with a better one that was not so temperature dependant. Here is the new schematic: http://img.photobucket.com/albums/v384/zning/NewSchematic.jpg
Went down to Sim Lim Tower(SLT) today after Physics SPA which i screwed it quite a bit because i forgot to change the units. Got some new components and went home to start soldering. Jin Zhe tagged along too. During the buying process, i was trying to find this opamp, OPA2134. Because it was not a general purpose opamp, it would be very difficult to be found in SLT. So i gave up on it and thought that i should just order it online through RS Comp or Farnell. But then, before i made my way home, i decided to go get some blackgates from Well Audio Labs at Burlington Square. Over there, Frankie, the owner of the shop if im not wrong, was very very friendly. Bought the blackgates from him and then i asked if did he sell opamps. He kindly replied no but then referred me to farnell and rscomp. Then i told him that i could not buy cause i did not have credit card but then he said is can one. Then he referred me to a company called Federal in SLT and said that they could bring them in for you. I was super happy and glad that i actually made my way down to Well Audio Lab to buy blackgates cause i not just got my blackgates but also got valueable information. Thanks Frankie! Went back all the way to SLT and went to federal. The people there were generall friendly but then i had not a very good experience cause this guy cut the queue and went first before me. Can't really blame him too cause i was like flipping through Farnell's and RS Comps catalogs so most likely the sales person was like "are u going to order something?" But anw, ordered the OPS2134 and it will take one day for it to arrive but i can only collect it on thursday. So here's some pictures!
Went down to Sim Lim Tower(SLT) today after Physics SPA which i screwed it quite a bit because i forgot to change the units. Got some new components and went home to start soldering. Jin Zhe tagged along too. During the buying process, i was trying to find this opamp, OPA2134. Because it was not a general purpose opamp, it would be very difficult to be found in SLT. So i gave up on it and thought that i should just order it online through RS Comp or Farnell. But then, before i made my way home, i decided to go get some blackgates from Well Audio Labs at Burlington Square. Over there, Frankie, the owner of the shop if im not wrong, was very very friendly. Bought the blackgates from him and then i asked if did he sell opamps. He kindly replied no but then referred me to farnell and rscomp. Then i told him that i could not buy cause i did not have credit card but then he said is can one. Then he referred me to a company called Federal in SLT and said that they could bring them in for you. I was super happy and glad that i actually made my way down to Well Audio Lab to buy blackgates cause i not just got my blackgates but also got valueable information. Thanks Frankie! Went back all the way to SLT and went to federal. The people there were generall friendly but then i had not a very good experience cause this guy cut the queue and went first before me. Can't really blame him too cause i was like flipping through Farnell's and RS Comps catalogs so most likely the sales person was like "are u going to order something?" But anw, ordered the OPS2134 and it will take one day for it to arrive but i can only collect it on thursday. So here's some pictures!
started off with components, breadboard, schematic and fulscap paper for planning.
Transferred the plan from fulscap paper to the breadboard. The lines are actually the busses that can be found behind the breadboard.
Don't you think it looks like some weird art piece?
Started soldering and in the end had this big forest of pins at the back.
This is my "custom made" resistor. Its rated 6W and its 0.6Ohms. Its actually just 2 X 1.2Ohm 3W resistor soldered together in parallel.
So this is the final piece.
And i broke them into 2 (:Now is to wait to get my hands on a drill and then drill my aluminium bracket so that i can mount the power devices and test it.
Oh! I got my aluminium plates cut to size already. Total there are 4 pieces, 2 big 2 small, with one of the 2 smaller pieces having a rectangle and 6 holes being cut. I think the rectangular hole was cut using a plasma cutter. Thats according to the lady i spoke to who helped me out.
Cant wait for it to be fully assembled!
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