Search results

Search Forums New Posts
  1. OLIVE2222

    LED down count

    Hi Viad, you can use this kind of circuit to do that: http://www.circuitdb.com/circuits/id/94 Olivier
  2. OLIVE2222

    PIC Type

    Hi, the PIC16F876A seems to be a downsized version of the 877A with 5 analog inputs. The package is a skinny DIP28. Olivier
  3. OLIVE2222

    Pressure control

    Hi, In order to regulate the air flow you indeed need to control a valve. The regulation can be build around an op amp scheme or via a µC. Of the shelf product exists to perform that, the keyword is Current to pressure (I/P), googling that will be a good starting point. Olivier
  4. OLIVE2222

    Resistor Identification

    Hi, here the way it's coded and a calculator http://www.breakup.de/resources/resistor.html Olivier
  5. OLIVE2222

    Help with project on Augmented Reality thru Head-Up Display

    Hi headUp display and welcome to this forum! OK, for this kind of application the GPS can, with a not that bad precision, locate you in a defined area (the street scene). To have visuals details in the helmet of what you are looking you must use accelerometer/gyroscope and...
  6. OLIVE2222

    1961 Harmony Stratotone Guitar

    Too cool to restore an old guitar. Please post sharp pictures of the unidentified components to help identification. Olivier
  7. OLIVE2222

    Please help with ultrasonic animal repeller circuit

    Hi, On the original design (link here under) few frequencies are generated sequentially. http://ratrepellent.net/home-improvement/rodent-repellents/ Here you select them with a switch but it's easier to do it by select R or C directly on the 555. One way to test it can be to test the right...
  8. OLIVE2222

    help on programming ATMEGA16A using USB AVR Programmer

    Hi, you don't receive any answer to you post maybe just because the S51 AVR USB Programmer is not a "popular" tool. For around 20$ you can have an AVR ISP programmer nativaly supported by Atmel the (free) AVR Studio and even supported by stand alone programming softwares. Maybe better to switch...
  9. OLIVE2222

    Problem with MT8870DE DTMF Decoder

    DEAD!
  10. OLIVE2222

    Problem with MT8870DE DTMF Decoder

    OK. Don't feel this is linked to C2 error but from what I can see Q2 ouput is out of order. Olivier
  11. OLIVE2222

    Problem with MT8870DE DTMF Decoder

    Is the Q2 output still low when you set TOE low? Olivier edit: and are other outputs working according to the decoded tone?
  12. OLIVE2222

    Infrared air hockey game scorer help needed.

    Hi, you can try to fit a plastic tube first, then you can increase the led current by decresing is serially connected resistor. Olivier
  13. OLIVE2222

    Momentary switch to change between circuits?

    Hi, this is the idea: http://www.allcircuitdiagram.com/stereo-channel-selector-170/#more-170 The push button increment a counter who select the output swiched with a cd4016/4066. You need simplify it to make it mono and you can supress the right led meter part. Olivier
  14. OLIVE2222

    Problem with MT8870DE DTMF Decoder

    jepoy12, the MT8870DE don't need the Crystal load caps ! better to add a driver for the leds or as a first test check the outputs with a multimeter. Olivier
  15. OLIVE2222

    Problem with MT8870DE DTMF Decoder

    Hi, the mistakenly connected 100nF cap (you mention .01µF which is 10nF) should not be the problem root. According to the HT9170 datasheet the available output current is 2.5 mA maximum. Are you using limiting resistors or a buffer at the the data outputs? Olivier
  16. OLIVE2222

    Omron Relay

    Hi, Here under they sold an equivalent. http://www.futurlec.com/Relays/HFD41-12.shtml Futurlec is slow to deliver but reliable. Olivier
  17. OLIVE2222

    Reverse Current Protection

    Hi, converting an AC powered product to something automotive/embedded can require more than a reverse battery protection. You can have high transient and load dump (when cranking) this can burn you supply front end or leave your µC, if any, in unknown state due to small supply interruptions...
  18. OLIVE2222

    I/O Expansion Of 16f877a

    Hi, Mikro Elektronika sell a 16-bit I/O expander based on the MCP23S17 http://www.mikroe.com/eng/products/view/142/port-expander-board/ It's a bit overkill compared to the suggested shift register solution but they provide many MikroC examples to drive it. Olivier
  19. OLIVE2222

    Infrared air hockey game scorer help needed.

    Hi, I confirm that the world has seen stranger things :) http://www.radioshack.com/product/index.jsp?productId=2049724 http://www.radioshack.com/product/index.jsp?productId=2062565 http://ecatshow.com/z.htm Olivier
  20. OLIVE2222

    Infrared air hockey game scorer help needed.

    Hi, according to the following link it's the opposite, the tinted one is the emitter and the clear one is the detector. http://www.pages.drexel.edu/~pyc23/ir_sensor.html Olivier
View older results
Top