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  1. MP1

    Eagle layout editor.

    Is the PG203J in the con-hirschmann library what you are looking for? Most users just put a 2 pin connector on the board and wire a jack to the case. There might be other connectors on the www.cadsoft.de website that can be downloaded. MP
  2. MP1

    circuit design

    The diagram you have posted from the data sheet will provide current up to 2 Amp. I recommend that you go with that one. The data sheet also has a suggested circuit board diagram. (The ST MicroElectronics Data Sheet.) MP
  3. MP1

    circuit design

    Can you give some information on the steppers you use? Perhaps there is some information on the internet. What is the make and model name on the motor? We really need to find the specs on your motors before answering the questions about power supply rating, etc. MP
  4. MP1

    Water Tank Water Level Indicator

    Hi Bob, Glad I could help. I am also not too sure about the resistor ladder they have in this article. The connections to ground through the water are building a voltage divider with the different resistors. All of your sensors below the water level will be connected to ground, so you have some...
  5. MP1

    Water Tank Water Level Indicator

    I didn't fully understand your earlier post. Please disregard the comment about the LM3914 output being low since it does not matter for the water level part. Silicon chip magazine had an article about doing this same thing using LM3914 in April 2002. Only exception: I would use 10 LEDs instead...
  6. MP1

    Water Tank Water Level Indicator

    Hi Bob, Wouldn't the LM3914 be better for your project? LM3915 is a log output normally used for sound VU and LM3914 is linear. Either way, these chips take care of the current limiting inside, so you do not need the resistors that would normally limit current to the LEDs. Will your sensor...
  7. MP1

    circuit design

    I really cannot answer this question clearly. Please look at my previous responses that will help you determine this. For example, if you take ohm readings between all of the pins on your motor, You will have two different values. Let's use 5 ohms and 10 ohms as an example since I do not know...
  8. MP1

    circuit design

    The L297 and L298 combination takes care of the sequence to the stepper. The address below gives a good description of how to do this with a pic micro controller. http://mech.vub.ac.be/teaching/info/mechatronica/finished_projects_2005/PICROCK/Electronic.htm MP
  9. MP1

    circuit design

    There is probably some literature that can be found for your motor, but the best way I have found is to measure the resistance between the wires or terminals on the motors. The windings are all going to have the same resistance. This will tell you which ones are the windings and which ones are...
  10. MP1

    circuit design

    Yes, I have added lines to your drawing to show the six wire motor and how it would apply. See the center tap on the coils. MP
  11. MP1

    no clean and clean manufacturing process

    I do not think there is an impact or effect when re-working. I was referring to the fact that using the "no clean" process, in my personal experience, causes the need for re-work. The so-called "no need to clean the boards" process causes bad soldering and has to be more thoroughly inspected. In...
  12. MP1

    tqfp 80 pcb design software???

    I can get smaller lines than 7 mil with the uv method. Not sure what you would get with the transfer method. I tried the toner transfer method years ago, but it was a new process at the time and was not very reliable. I have never tried it again since. MP
  13. MP1

    Water Tank Water Level Indicator

    Yes, certainly a low cost circuit to try. I think it would light the LEDs ok. MP
  14. MP1

    Water Tank Water Level Indicator

    Hi Bob, Here is something similar to what you requested. You could also use a LM3914 or comparators to do this. Ante's suggestion is also a good one if you want an alarm instead of bargraph. MP
  15. MP1

    Timed dimmer (ie "Dawn simulator")

    You can turn the light on slowly with a Pulse Width Modulation (PWM) circuit. The expensive units in your link are most likely controlled with a microcontroller. You could certainly make a PWM circuit without micro connected to the buzzer circuit of an existing alarm clock. I do not have the...
  16. MP1

    circuit design

    The only difference between connection of 4 wire and 6 wire is that you do not connect the center tap on the coils of a 6 wire stepper. This makes a 6 wire stepper a 4 wire stepper. There are schematics all over the internet for the L297 and L298 combinations. Here are links to a few of them...
  17. MP1

    no clean and clean manufacturing process

    Here is an article that describes it pretty well: http://smt.pennnet.com/Articles/Article_Display.cfm?Section=ARTCL&ARTICLE_ID=249818&VERSION_NUM=2&p=35 In my opinion, don't use the "no clean" products if you do not want re-work or repairs. MP
  18. MP1

    Parallel port interfacing

    D0 is LSB and D7 is MSB on Parallel port. Is this what you wanted to know? D0 on Parallel port connects to LSB on the ADC0808. MP
  19. MP1

    clock signal for adc0809

    640k is a good typical clock frequency for this chip. Check the duty cycle from the function generator, though. Is it 50%? MP
  20. MP1

    circuit design

    Queen, Yes, you can use L298 and L297 for stepper control. These chips are usually used when you have substantial current needs. The ULN device you have posted will provide enough current for most smaller steppers. I have discussed steppers in a few different threads on this site in the past...
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