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Description: Elementary questions about electronics.
 

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Minimising current in unused op amp 
  Hi All, Having found dual op amp packages around a fifth the price of comparable single packages from online distributors, I think i'll go for the double. (BTW, I'm using supply of +16, and ground). I don't want the unused channel drawing current unnecessarily though, or bouncing the output around.. - If I tie the non-inverting input to... more »
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astable multivibrator issues - 2N3904s work, but not TIP31As 
  I built an astable multivibrator with blinking lights (much simpler than using a 556!), as a test for a circuit that will use a power transistor (or MOSFET) to pulse a transformer primary for future experiments. [link] Strangely, when I replaced the two 2N3904 transistors with TIP31As,... more »
By mrdarr...@gmail.com  - Jul 3 - 8 new of 8 messages    

information about bridge rectifier 
  hi thanks for ur kind informaation which u have given,but i want to know a small detail about bridge rectifier. DOES THIS BRIDGE RECTIFIER CAN BE CONNECTED TO THE 230VAC/50HZ SUPPLY ,WITH OUT TRANSFORMER. DOES IT WITH STAND THAT VOLTAGE OR IT HAS TO ISOLATED.IF IT HAS ISOLATE YELL ME THE ALTERNATE METHOD TO... more »
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what happened to the H2SO4... 
  Someone emailed me this answer to where did all the acid go to my battery question. I'm reposting it here FYI: The Sulphuric acid (H2SO4) is a liquid. Normally a battery uses a dilution of around 25% acid in water. As you discharge the battery the acid content is converted to Lead Sulphate, and regenerated as... more »
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