my own avr devolopement programming board

8 Mar 2015

hai every one...

i am new to element 14.. i am beginner to electronics.. i have a doubt ..

i started to design my own avr devolopement programming board last week.. i soldered components and followed the site-

www.robotplatform.com/howto/...board/atmega8_dev_board_3.html.. i connect my board to 9v supply, the output to board should be 5v using a voltage regulator 7805.. but when i checked my voltage at board using multimeter it shows only 0.95volts... also my status led is also not glowing... i rechecked all the connections.. it was absolutely right... guys help me...

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michaelwylie over 10 years ago +1

You have the input and output caps on the regulator? It can be unstable without them.

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kouruu over 10 years ago

Looking at his picture and the guide he referred to, he only has 1 cap on the Vout. Having no decoupling caps on the Vin and Vout could give variations in the voltage, but it shouldn't be that low. That kind of behavior is usually due to either a short, no power or a failed device or passive.
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kouruu over 10 years ago

Looking at his picture and the guide he referred to, he only has 1 cap on the Vout. Having no decoupling caps on the Vin and Vout could give variations in the voltage, but it shouldn't be that low. That kind of behavior is usually due to either a short, no power or a failed device or passive.
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