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  1. ramussons

    Delay off circuit

    If the highlighted words are without much emphasis, well fine. You have a simple solution. If, however, "stays constant" is further emphasised, you may have a far more complex solution.
  2. ramussons

    Amplifier wiring problem

    There seems to be another module missing ..... the power supply module that has to come between the Transformer and the Amp.
  3. ramussons

    DIY Audio Amplifier???

    Was'nt the OP on Design a transistor Amplifier?
  4. ramussons

    DIY Audio Amplifier???

    Google is your best friend. Give you a couple. https://backyardbrains.com/experiments/transistorDesign http://www.sentex.ca/~mec1995/tutorial/xtor/xtor8/xtor8.html That aside, unless you have studied something on transistors, at least the operating principles of a transistor, the above will...
  5. ramussons

    Switch help

    From the photos, I would say it's a 2 pole 2 way miniature slide switch. Something like this.....
  6. ramussons

    Switch help

    What was that broken switch supposed to do? Change Bands? Switch ON the radio? A photo of the PCB will also help.
  7. ramussons

    Help to solve Operational amplifier

    am getting old ... :D
  8. ramussons

    Help to solve Operational amplifier

    The swing will be +/- 10 Volts, which, as per my calculations, will give 12.5 W RMS
  9. ramussons

    IF choices

    I linked the term "common" to common broadcast radios :D not to professional equipment. Did'nt think the OP had gone to that level of explanation.
  10. ramussons

    Help with a simple receiver.

    The given circuit is basically the front end of this (from Colin's ref). 4.7uF seems unnecessary, but may do no harm.
  11. ramussons

    Help to solve Operational amplifier

    An ideal Op Amp will give a max swing of 10 Volts, so it can deliver 10^2 / 8 = 12.5 Watts RMS. I could not understand this part in your post.
  12. ramussons

    IF choices

    Common combination? :confused: The only place where I've seen this is in a SCPC satellite receiver channel modem :D
  13. ramussons

    Transformer; How do I calculate turns and volume.

    AFAIK, Magnetic Amplifiers will need a special core material. Normal transformer cores are not suitable.
  14. ramussons

    Help to solve Operational amplifier

    Frankly, I'm not able to figure out what is being asked for except Task 3. C5, R8, R5, C2 form a Bandpass Filter. U2 with R7, R6 and C1 is an active High Pass Filter with around 5Hz cutoff decided by R6 C1.
  15. ramussons

    Replacing a faulty SMPS

    I doubt if the "original" schematic is in order. Did you trace it or was it available as a drawing? It's not possible for the electronics in a washing machine to be "hot" wired. Even if it is :eek: , you can technically connect the "common" of "your" power supply to the "phase". I will NOT...
  16. ramussons

    anyone can tell me Australia wireless spectrum?

    See what is the Frequency of a Home WiFi Router. That's certainly one for civilian use. :D
  17. ramussons

    Interchanging Triacs

    http://pdf1.alldatasheet.com/datasheet-pdf/view/400722/STMICROELECTRONICS/BTA08-600C.html http://www.datasheetarchive.com/BTA08-600B-datasheet.html
  18. ramussons

    Interchanging Triacs

    To start with, the Voltage and Current ratings are different BTA08-600C handles 600 to 800 Volts, but at 8Amps BTA08-600B 400 Volts at 25 Amps
  19. ramussons

    Radio, ac or dc?

    Can you upload a few photographs of the Radio and it's insides? There is likely to be DC available, and one should be able to use a 7805 or 7905 to get 5 volts. Does the radio use NPN or PNP transistors?
  20. ramussons

    Analog wifi repeater - possible?

    If you know the WiFi frequency, why not use a passive solution? A Yagi Antenna outside connected to a Monopole inside. We have used this solution in quite a few places for Indoor Coverage of 900 / 1800 / 2100 MHz mobile signals.
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