Search results

Search Forums New Posts
  1. A

    Help identifying what this..is?

    go to www.molex.com under "product type" you will find it there. Digikey used to keep some molex stuff
  2. A

    Need help identifying part

    I have seen similar parts with the typical blue color in the past by Siemens. Also BMW - Germany- Siemens, make sense?
  3. A

    DC to AC

    "This inverter is of a traditional ferroresonant design using large step-up transformer" This type of transformer to obtain a sine output is hardly used anymore because of high cost, bulk and is also not very efficient. http://www.allaboutcircuits.com/vol_2/chpt_9/6.html "Ferroresonance" is...
  4. A

    Making a 0-28VDC@0-3A Power Supply using linear regulators (LM350)

    Product Description 2K Ohm 2 Watt Pot 2K ohm by PEC/Canada. Perfect for LM317, LM350 circuits. 3/4" long shaft. With hardware. RES1352.... Price: $2.49 Part No.: RES1352 Put resistor in parallel to get value down to 500R 500 Ohm 10 Turn Pot Price: $9.95 Limited availability. 2 watts Part...
  5. A

    Need help identifying part

    100nF capacitor made by Siemens
  6. A

    DC to AC

    Here is something interesting. I guess it depends which databook you look at
  7. A

    DC to AC

    I think the block diagram is a bit misleading. You get a better idea from the logic diagram which shows a combination of inverters used to obtain Q and Q_bar Also the way they drawn it may be a way of indicating that the FF has buffered outputs. Will be difficult to tell without the details of...
  8. A

    DC to AC

    MP, The way I read it is that the %duty at Q and Q_bar will be 50% and that the signal at the oscillator output is not guaranteed to be 50%
  9. A

    Miniature FM transmitter modifications

    Read here http://www.electronics-lab.com/forum/index.php?topic=4741.56
  10. A

    FM deviation meter

    I am building a FM stereo transmitter from a kit and need to measure my modulation or also called deviation when on air. Where can I find a circuit to do this? The only thing I found was here http://www.edmdesign.com/mic.htm where they use a small radio. Any idea what the "additional...
  11. A

    Audioguru FM Tx

    Yes that might be the reason. I was searching for prices on the 2n3866 and 2n4427 and found Mouser have them at $1.60 and $2.00. Unable to find any sale of the Bfs22a. The only ones are the component brokers that wants you to ask them for a quote. I tried them before and boy they want you to...
  12. A

    Audioguru FM Tx

    I wonder why this circuit from Harry using very much the same transitors only produce highest 180-360mW?? http://web.telia.com/~u85920178/tx/v7_proj.htm
  13. A

    Audioguru FM Tx

    Maybe, he is very quiet
  14. A

    Audioguru FM Tx

    Think sssaaa will be happy now? ;D Hey sssaaa what you say?
  15. A

    Audioguru FM Tx

    What is the power of this micromitter? Only 16 channels? This can be a problem where the band is very full
  16. A

    Audioguru FM Tx

    Or get you own island
  17. A

    Audioguru FM Tx

    Here is the follow up posted. Also tested with a BFS22A transistor. Work ok, but output slightly lower (~830mW) as this transistor needs a bit more drive being a 4W device. Overall the 2N4427 is the best choice, giving me 1.3W @ 12V and 0.8W @ 9V with about the same harmonic performance.
  18. A

    Audioguru FM Tx

    This circuit was posted on the other board For all those that were asking for more power, well here is a design. This uses the output of the last circuit I posted at about 100mW. The power transistor can be a 2N3866 or 2N4427 and both work well. The transistor runs quite cool and needs only a...
  19. A

    7.6MHz Crystals

    You can only pull by about 0.2% of the marked frequency
  20. A

    FM Radio

    I see the drawing has been modified now. The anode is connected to +5V through the inductor. This is wrong! The diode will now be conducting when the pot is set low enough or less than 4.5V on the slider. It will not function as a varicap anymore. The original diaram was correct.
Top