hi all
its been some time since i last posted in here. what with decorating and a change of OS (i forgot to save my favorites off) ive had a bit of time finding the forum again. Found you!!! well my last post involved the workings of darlington transistors i needed to drive a pair of filament bulbs in parallel. thanks to all for your advice. i am now at the stage where i have used press n peel to mark a pcb for etching. this is done and im going to be building the circuit proper over the next few days. its only the second time ive ever done my own PCB and what a difference having readily available materials like press n peel has made. theres still a bit of a knack to it. only 3 attempts to get a good masking. etching took 10 mins with ferric chloride in a tray which itself was sat in a tray that had hot water in it to warm the solution up and speed up the effect. All good fun and im pleased with the result. i just hope it all works once its built. i should mention that the sound to light is in addition to another part of the circuit that is a voice modulator...........voice mod........flashing lights.......you got it yet???? think pepper pots. any way i present a picture of the PCB for your viewing. you might notice the PCB's shown are marked differently so actually ive done my own board 3 times in 20yrs. the middle pic is the first of this pair and showed up some areas that needed moving and adjusting to suit wires that will carry the power and just make it less of a crowbar job soldering in and around the board.
its been some time since i last posted in here. what with decorating and a change of OS (i forgot to save my favorites off) ive had a bit of time finding the forum again. Found you!!! well my last post involved the workings of darlington transistors i needed to drive a pair of filament bulbs in parallel. thanks to all for your advice. i am now at the stage where i have used press n peel to mark a pcb for etching. this is done and im going to be building the circuit proper over the next few days. its only the second time ive ever done my own PCB and what a difference having readily available materials like press n peel has made. theres still a bit of a knack to it. only 3 attempts to get a good masking. etching took 10 mins with ferric chloride in a tray which itself was sat in a tray that had hot water in it to warm the solution up and speed up the effect. All good fun and im pleased with the result. i just hope it all works once its built. i should mention that the sound to light is in addition to another part of the circuit that is a voice modulator...........voice mod........flashing lights.......you got it yet???? think pepper pots. any way i present a picture of the PCB for your viewing. you might notice the PCB's shown are marked differently so actually ive done my own board 3 times in 20yrs. the middle pic is the first of this pair and showed up some areas that needed moving and adjusting to suit wires that will carry the power and just make it less of a crowbar job soldering in and around the board.
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