Hello this is my first post, I'm new to electronics and don't know very much so I'm sorry if this question is dumb.
I have built a circuit but I'm having problems and I think it's because I've not setup the regulator correctly.
the power (9v battery)enters a 6vreg which then powers a 3.3v ldo.
the 3.3v ldo feeds into a pic18 uC
the 6v feeds into a ftdi usb module, a parallax continuious rotation servo, a laser, and a webcam.
when the servo is rotating all is well.
when laser is turned all is well.
I'm using the pic18 adc to read the 10K variable resistor - which doesn't give me consistent results - but not having used an adc before I don't know if this is normal.
but if I have the servo and laser do their thing at the same time things start to go bad.
so I started poking around with a voltmeter and noticed the 6v reg, is pushing 8v not 6v.
I don't have any capacitors for either of the regulators and wondering if this is causing the problem.
when i turn either the laser on or off the voltage drops about 1v when the laser is active and several volts (perhaps 4v I think) when the motor is turning. there is a npn transistor connecting the pic 3v to the lasers 6v - used as a switch.
so I so decided to read the datasheets for the parts and see (i didn't read them in depth before because I don't understand them yet - working on it) they recommend both input and output caps.
before I put the cap. onto the circuit can someone tell it I'm barking up the wrong tree. Or any other information that will help me.
parts list
reg v6 - L7806CV
ldo 3.3v - mcp1700-3302e
thanks
K
I have built a circuit but I'm having problems and I think it's because I've not setup the regulator correctly.
the power (9v battery)enters a 6vreg which then powers a 3.3v ldo.
the 3.3v ldo feeds into a pic18 uC
the 6v feeds into a ftdi usb module, a parallax continuious rotation servo, a laser, and a webcam.
when the servo is rotating all is well.
when laser is turned all is well.
I'm using the pic18 adc to read the 10K variable resistor - which doesn't give me consistent results - but not having used an adc before I don't know if this is normal.
but if I have the servo and laser do their thing at the same time things start to go bad.
so I started poking around with a voltmeter and noticed the 6v reg, is pushing 8v not 6v.
I don't have any capacitors for either of the regulators and wondering if this is causing the problem.
when i turn either the laser on or off the voltage drops about 1v when the laser is active and several volts (perhaps 4v I think) when the motor is turning. there is a npn transistor connecting the pic 3v to the lasers 6v - used as a switch.
so I so decided to read the datasheets for the parts and see (i didn't read them in depth before because I don't understand them yet - working on it) they recommend both input and output caps.
before I put the cap. onto the circuit can someone tell it I'm barking up the wrong tree. Or any other information that will help me.
parts list
reg v6 - L7806CV
ldo 3.3v - mcp1700-3302e
thanks
K