Too bad it didn't work. Is this design preferable to one which uses 7815/7915? Hope that's not a stupid question. Yes, I find soldering the pcbs is my favorite part of a project. It IS therapeutic!
If the "e" on the silkscreen is for the emitter then I think you have the pass transistors in backwards. BD139 pins are Emitter, Collector, Base with the front of the package facing you. If you want 15v then a 6.8v zener will get you closer.
@@AstrosElectronicsLab I'm at work now also. But thanks for the schematic, I will look to it and then I will let you know what can be done to have the output without voltage drop just please remember me how many volts need on the output and how many milliamps to handle!
@@SymbolTech21 +15, -15 and +12, the +/-15V doesn't need to handle more than 150mA, the +12V needs to handle about 150mA. However, I'm having a new PCB made with a new design, but I would like to fix this one. I'm leaning towards the choice of output transistors is wrong. I probably should be using TIP41C and TIP42C respectively. I will look in to this myself as well over the weekend. Cheers, J.
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I agree. Reusing components which are still ok and not damaged it's also my favourite
Too bad it didn't work. Is this design preferable to one which uses 7815/7915? Hope that's not a stupid question. Yes, I find soldering the pcbs is my favorite part of a project. It IS therapeutic!
Higher input voltage. 7815/7915 max input voltage is 30V.
If the "e" on the silkscreen is for the emitter then I think you have the pass transistors in backwards. BD139 pins are Emitter, Collector, Base with the front of the package facing you. If you want 15v then a 6.8v zener will get you closer.
HA! So obvious, you're right, they're backwards! Damnit!
Haha! Glad there was a solution. Good call! Sometimes we miss things. BTW, I recently bought some Rubycon 220uf 50v caps with 2.5 lead spacing. Handy.
How many volts zener diode you used ?
7.5
@@AstrosElectronicsLab do you mind showing the schematic because I think the zener makes to have the voltage drop
Sure, sorry I was at work. Here you go: imgur.com/a/vA17iB5
@@AstrosElectronicsLab I'm at work now also. But thanks for the schematic, I will look to it and then I will let you know what can be done to have the output without voltage drop just please remember me how many volts need on the output and how many milliamps to handle!
@@SymbolTech21 +15, -15 and +12, the +/-15V doesn't need to handle more than 150mA, the +12V needs to handle about 150mA. However, I'm having a new PCB made with a new design, but I would like to fix this one. I'm leaning towards the choice of output transistors is wrong. I probably should be using TIP41C and TIP42C respectively. I will look in to this myself as well over the weekend. Cheers, J.