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An op amp can be used as an attenuator with a higher value of Rg than Rf. On that note I have a similar question. I am trying to get nanoVolt response out of a DAC but the smallest reference is 400Mv which leaves terrible resolution out of my DAC. Is the best solution to use my OP-amp attenuator...
I simplified the design and now blowing the 4081 when a resistive load is connected on the M1 and M2 terminals. Using a milliamp meter and a 220ohm resistor the h-bridge works fine in 31khz pwm as I increase resistance to 100ohm I get the calculated milliamps at 24v but the 4081 gets hot. and a...
I am having the same problem but I am using a hip4081 full h bridge it may be unrelated yet ironic so I will post a new thread but also looking at this one.
with straight battery power(24v dc) I do not measure any noise as the batteries must be absorbing it. I measure 13 amps start current and 3.3 amps no load but that is with a brick under the carriage and the wheel free spinning. I left the brake off(by accident) and it blew a 30 amp fuse. while...
As soon as I connected the big motor, I put the scope to record and 12 volts at 5 kHz pwm it blew the mosfets, the 30 amp fuse and the 4081. I do not have a way to do 6 volts. the scope shows ac with 70v pole to pole even though dc is sent out. I was unclear in post#1 R5 and r6 are not in the...
What is the best way to determine the inductance of L2 and L3? and is L1 necessary? I will replace the mosfets Change the PWM freq. to 5khz and let you know the results
sorry about d-10 and d-11 I redrew the original as it was cluttered with all the other circuits such as microprocessor relays etc. I did not want to delete the original and did not want to confuse people with things unrelated.
the mosfets are n-ch and on the scope gate voltage in both directions...
to make one board double sided 6x6 cost $15 plus chemicals $15and time to drill $6 for drills makes it around it depending on how many holes thats about an hour. I can make one in about 1.5- 2 hrs. At $50 that is a total profit of $14 you can make more money at Mcdonalds.
I have several questions about this drive circuit I have made. After breadboarding and running a small motor this circuit works.(with the exception of R9 and R10 which I added but not breadboarded) It is when I make the main board I have problems( although the small motor still runs) when the...
this may not be the cheapest but I have had a lot of success with wi-fly modules as they are easy to setup. and they store all the info in them. I chose a different route this time and bought a wifi shield from arduino(because of a app i found on the internet said it did not support wifi-bee.)...
it took all day and I updated the firmware and it only works with connect with WPA script. All other scripts do not work. in the wifi example section in Arduino 1.0.5 Any ideas?
I have a new wifi shield(arduino brand model a000058). Using the github library the arduino will not compile in v1.0.1 but will compile in 1.0.5. I can connect using the example files but when I use SendRecieveudp, I do not receive udp packets. Using two iPhones, I can send udp packets from one...
I have a arduino L298 Motor shield, Driving 2 24 volt 300 watt motors. Can I adapt this to drive these motors? and How. I will use irfp2907 Mosfets with freewheel diodes. Please help.
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