Search results

  1. gorgon

    Is there a chance to get blind or serious physical damage while prototyping ?

    Been there, done that. I once got a piece of a disk sander embedded in the middle of my cornea, and that distorted 'view' of a scalpel scraping and pulling your cornea is not recommended. Neither are the pain and light sensitivity for days afterwards. I did use normal glasses, but not safety...
  2. gorgon

    Looking for a component marked "made in Austria"

    Here is a picture of the relay in question:
  3. gorgon

    Looking for a component marked "made in Austria"

    Schrack relays used to be made in Austria, and I suppose they still are under the Tyco Electronics Schrack brand. I just went down in the workshop and found a 12V SPDT relay (8A 250VAC). If you want, I can send it to you. Just send me your address.
  4. gorgon

    Auto switch from invert to mains and vise- versa

    A thing to remember is if you have motors running on this power. Changing power source while running may cause very high voltages and currents going through the system. You should always stop the motor, and start it from the new power source, if you use a switching system.
  5. gorgon

    preperation for developmemt

    Are you going to sell your products in Europe, you need several approvals for CE markings, ROHS approval for production, and more.
  6. gorgon

    preperation for developmemt

    The number one step in all design is a complete specification of what you want to make, based on the market you may have, and a target price. If you don't have any customers willing to pay the price, there is no need to make anything.
  7. gorgon

    IR proximity sensor

    All active transmitter/sensor systems will require a higher power consumption than a PIR solution. If this is based on a battery powered unit, I would think that the best is to make it passive, and some form of IR sensor would come to mind. A PIR sensor is based on a 'picture' of points, and the...
  8. gorgon

    preperation for developmemt

    Make sure you document the prototype(s) with proper schematics, so you know the different steps you have been through. Working with sensitive RF circuits, it may be of use to make proper PCBs for the prototyping, since this will reduce the number of variables coming from a flimsy breadboard.
  9. gorgon

    Trouble with tribbles.. erm, timers.

    I have the feeling that you are a bit off target here. To get a proper duty cycle for the intensity, you need to sub divide each frame into 18 columns, and then into 20 intensity levels. The 'window' you have for the 20 intensity levels are 1.111 ms for each column, giving 55.555 us for each of...
  10. gorgon

    Trouble with tribbles.. erm, timers.

    I think you need to have an update frequency of more than 25, as far as I know 50 is about the lowest update rate you can have without visible blinking. I've already done the math for that in post #76. Just an example: An old normal cinema movie have 24 frames/second on the roll, but in the...
  11. gorgon

    Trouble with tribbles.. erm, timers.

    I've not looked into the code in detail, but one thing made me react. I can't see the need for disabling the outputs while shifting in data. As long as the latch clock is not activated the contents of the outputs are stable, even when shifting. This is really one of the good things about this...
  12. gorgon

    M2732A can not erase or program

    I just checked up the datasheets for the STM and the Intel version of this EPROM. They say to be careful to select the M2732A since the M2732 need a higher voltage that will damage the A part. (21V vs 25V)
  13. gorgon

    Who etches photoresist PCBs?

    Where in Norway are you from? Since I'm from Norway myself I may be of help. I live in Østfold.
  14. gorgon

    M2732A can not erase or program

    I have 3 questions about this. Have you programmed any other EPROMs or other chips in the programmer, and verified that it works after your tried the 2732s? Have you selected the correct EPROM type in the programmer? The 2732A is a NMOS chip and I would think it requires a high voltage Vpp. Have...
  15. gorgon

    Assembly code for arm

    As far as I can see from comparing your code with an example in the 'ARM Assembly Language - an Introduction' by J.R. Gibson, the only actual fault you have, is to use a mixed upper/ lower case to the directive Area,. You can use either upper OR lower case, but NOT a mix. Since the AREA...
  16. gorgon

    What does "JP" on a pcb mean?

    Inside the big black blob there is a small microcontroller. This controller has a clock that drives the digital part of the circuit. To cancel all noise from the internal and external signaling you use capacitors for decoupling. Even if this is not an actual AC voltage, it is in fact an...
  17. gorgon

    Components and Operating Temperature

    Most components are limited to no more than 125C, mostly lower. You need to look in the datasheet for the component in question. Above 150C there are very few and expensive components available. You also need to take the ambient temperature into the calculation, raising the ambient temperature...
  18. gorgon

    Can SMPS interfere with 5.8GHz transmitter signal

    If these SMPS circuits are part of the camera supply system, there may very likely be ground noise problems. It depends on how you distribute 0V or GND in your chopter, and how good your decoupling are.
  19. gorgon

    Distance measurement using HC-SR04

    If your picture is correct, it looks like you are overwriting the result with 0.0 continuously, making a blur.
  20. gorgon

    stuck in RPM measurement using pic 18f452

    Normally there will be some jitter on the pulse train, and averaging the period time over some pulses will filter out the most prominent jitter. Don't use too many samples since changes in RPM will then be delayed. It depends on the quality of your measurement setup. If your program monitor...
Top