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  1. OLIVE2222

    Need experts help with old Tandy multimeter...

    Hi, 9.5 Ohms are hard to get, 3.3 ohms + 6.2 ohms in the E24 serie will be OK 110 K is a standard E24 value better to go for 1 or 2% precision resistance. Olivier
  2. OLIVE2222

    Custom DJ Karaoke Mixer/Scratch Pad/Laptop

    Hi Chris, Finding circuits on the net and modify them to suit your need is quite a good idea ! This preamp looks OK, yes R5 control the gain, you can leave it for the first tests. The idea is to add the tone control stage with the uncommitted amplifier after this preamp. So having a small...
  3. OLIVE2222

    Guitar Delay Pedal.

    Hi trained monkey, Delay pedals are somewhat different from others because you don't modifiy the signal as in distorsion, vibrato or others The delay can be done via signal shifting in BBD lines (the analog way) or sampled/stored and replayed (the digital and more recent way) Dedicated...
  4. OLIVE2222

    Custom DJ Karaoke Mixer/Scratch Pad/Laptop

    Hi Chris, Good to see that you find out you need to start from something more realistic than a fully featured DJ setup. Be ready for a long (even for the mixer only) but very rewarding process ! having a quick look on your schematic it's don't look too bad. Input capacitors are reversed...
  5. OLIVE2222

    parralle adressable sound chip

    You welcome moonmonkey! no need to post your question in 7 different forums knowing that electronicspoint is the worldwide reference ! :D:) Olivier
  6. OLIVE2222

    Using a bluetooth dongle to control an electronic signal

    Hi snap61, Welcome to you ! An bluetooth dongle is not something self contained. A processor must interface it. So the minimum setup will be: USB Dongle <-->Processor-->Buzzer and a software. However for your device the USB option is probably not the best one as you need to...
  7. OLIVE2222

    parralle adressable sound chip

    Hi moonmonkey, The following module allow you to play mp3 files stored on a SD card. A parallel mode allow to play 8 files by setting one bit high. http://www.robotshop.com/world/productinfo.aspx?pc=RB-Rog-05&lang=en-US...
  8. OLIVE2222

    Creating a multi RF point for TV

    Hi Dave, Thank you for your support. Indeed rotary switch is a nice solution! If you don't talk about a DIY unit, do you have any idea where to find something off the shelf, HAM shop maybe ? Which kinds of connectors are fitted on you unit? Olivier
  9. OLIVE2222

    Help identifying some parts...

    Hi, You completely right, i mix up the datasheets, sorry. Your IC should be a 24C32, where pin 2 can (address1) can be grounded. All those I2C eeprom have the some pinout and the same protocol, so no need to find out the exact brand/model. Olivier
  10. OLIVE2222

    How to use Piezo Electric Tape?

    Hi hosseinz8050, You can do more searches with piezo scavenging and piezo harvesting keywords. Olivier
  11. OLIVE2222

    Help identifying some parts...

    Hi, The "C32S" "49A028" is indeed certainly an I2C EEPROM probably a 25C32 (they are no 49K or 28K eeprom ...) Olivier
  12. OLIVE2222

    How does an IR pen scanner work? Need to know now, ie before Christmas

    Anne, I will not comment your choice to discard cell phone because of EMF. The infrared pen scanner work with light not visible for the human eyes. It's work almost as the bar-codes scanner readers in supermarkets, the precision is just improved in order to read the smalls globe signs. The...
  13. OLIVE2222

    Help about transmitter and receiver

    Asad, You already "measure" the PPM as the voltages values you give in your first post are averaged values of the pulses (the wider the pulse the higher the voltage). More precises measurements needs a scope. If you want to control the motor in both directions, especially with relays, you...
  14. OLIVE2222

    Creating a multi RF point for TV

    martits, Having the need for 10 way TV switch (technically a UHF 75ohms switch) is not somewhat common for home appliance. The closer seems to be SAT switch use to select LNBs. They start working on frequencies from around 1Ghz, not sure if they can work on the lower UHF band. You must select...
  15. OLIVE2222

    Surface mount heatsinks

    Hi jackorocko, If it's a one shot on an existing board probaly better to make a bit of heatsink surgery and indeed to glue it with thermal conductive glue. http://www.farnell.com/datasheets/22500.pdf Olivier
  16. OLIVE2222

    Creating a multi RF point for TV

    HI martits, 2 or 3 TV cable switch can be easy to find. 10 channel will be more challenging for (mechanical) TV switch. It will be easier, if possible, to connect all your games consoles composite video +audio out to a easy to find 10 channels video+audio switcher and to add a TV modulator...
  17. OLIVE2222

    Looking for a way to get 16 LEDs to flicker at "random" in a circuit

    Hi, For the analog control of the leds, a PWM circuit can be implemented. The PWM controlled transistor must be located between the common led supply (or GND) pins and the power supply (or GND). Olivier
  18. OLIVE2222

    Decoder/Shift Register

    Hi Tave, A decoder convert data from a given format to another format. Can be binary to bcd, bcd to decimal or any combination. What your friend is probably going to use is an address decoder. They are primarily intended to select one chip a time in µC or CPU circuits. Here he can address...
  19. OLIVE2222

    Surface mount heatsinks

    Hi, Yes reflow is the normal method however smaller components can suffer a lot because of the higher temperature to be used. Having 0402 sized components in the neighborhood of large ceramic QFN or BGA packages can already make them fail (immediately or in a very short term). Is there any...
  20. OLIVE2222

    Desoldering eeprom - Hot air temperature

    MrWho, OK with a hot air rework station chose the adapter they well surround the component and use a solder flux to speed up the process. being fast and backup the content are still applicable :) Olivier
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