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Chip Amps Amplifiers based on integrated circuits

3 way active speaker system + Subwoofer based on Lm 3886 & 4780
3 way active speaker system + Subwoofer based on Lm 3886 & 4780
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Old 17th April 2012, 03:55 PM   #11
sulabh is offline sulabh
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Join Date: Feb 2010
one dammn easy method of etching the PCBs at home...
1. Get the print out of the circuit from a laser printer on a glossy papaer, preferably the paper available in market from the stationaers just by the name of glossy foto paper used for foto prints.

2. Cut the pcb of same sizde as the print

3. Keep an iron ready, put the print on the pcb and start pressing it putting some weight over it.

4. After 4-5 full presses, the whole print is transfered over the pcb.

5. Put the PCB with ink transfered over it ina solution of water+FeCl3.

6. Shake the PCB in the solution for some time.

7. Soon there will be a visble indiacation of the copper getting removed from the pcb and the tracks remaining.

8. Polish the PCB to protect it from rusting

9. Or you can tin the tracks after the soldering is done.

10. The PCB is ready to be soldered.
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Old 18th April 2012, 04:18 PM   #12
pra3718 is offline pra3718  India
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@kuldeep, your pcb making is interesting.. How do you do it ?
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Old 18th April 2012, 04:51 PM   #13
jeff29jeff2002 is offline jeff29jeff2002
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Join Date: Oct 2010
Quote:
Originally Posted by sulabh View Post
one dammn easy method of etching the PCBs at home...
1. Get the print out of the circuit from a laser printer on a glossy papaer, preferably the paper available in market from the stationaers just by the name of glossy foto paper used for foto prints.

2. Cut the pcb of same sizde as the print

3. Keep an iron ready, put the print on the pcb and start pressing it putting some weight over it.

4. After 4-5 full presses, the whole print is transfered over the pcb.

5. Put the PCB with ink transfered over it ina solution of water+FeCl3.

6. Shake the PCB in the solution for some time.

7. Soon there will be a visble indiacation of the copper getting removed from the pcb and the tracks remaining.

8. Polish the PCB to protect it from rusting

9. Or you can tin the tracks after the soldering is done.

10. The PCB is ready to be soldered.

tHANKS....VERY HELPFUL...
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Old 19th April 2012, 09:33 PM   #14
Bazukaz is offline Bazukaz  Lithuania
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Join Date: Nov 2005
Location: Vilnius
3 way active speaker system + Subwoofer based on Lm 3886 & 4780
Quote:
Originally Posted by sulabh View Post
one dammn easy method of etching the PCBs at home...
1. Get the print out of the circuit from a laser printer on a glossy papaer, preferably the paper available in market from the stationaers just by the name of glossy foto paper used for foto prints.

2. Cut the pcb of same sizde as the print

3. Keep an iron ready, put the print on the pcb and start pressing it putting some weight over it.

4. After 4-5 full presses, the whole print is transfered over the pcb.

5. Put the PCB with ink transfered over it ina solution of water+FeCl3.

6. Shake the PCB in the solution for some time.

7. Soon there will be a visble indiacation of the copper getting removed from the pcb and the tracks remaining.

8. Polish the PCB to protect it from rusting

9. Or you can tin the tracks after the soldering is done.

10. The PCB is ready to be soldered.
Between steps 4 & 5 I put PCB with paper(which is glued to the board by toner) to warm water a for few minutes. Then paper can be easily removed and if there are some spots that get ripped off can be easily repaired with permanent marker.
Some hints : I found it very important to clean PCB well with acetone or so before ink transfer. Many types of glossy paper work , including magazine pages and so on, some better some worse.
However be sure that paper does not have plastic coating! Laser printer heats paper and if plastic coating gets melted then printer can go to a bin.
Good luck!
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