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  1. WHONOES

    Controlling an Actuator

    Need more info. What actuator on what machine how do you plan to drive it etc etc. Some comprehensible diagrams would be very useful.
  2. WHONOES

    PSpice boost converter output voltage problem

    I use a simulator called SIMETRIX, have done for many years in my professional life and now in retirement. I think it is the best of the bunch. One thing to remember when doing this sort of simulation is that the inductor will need some dc resistance. I generally include it as a small value...
  3. WHONOES

    PSpice boost converter output voltage problem

    Tried it on my simulator and am getting about 740V. What sim are you using?
  4. WHONOES

    Battery charger/battery type NMH

    You can use a simple current limited charger without wrecking your batteries. You charge the batteries at the 14 hour rate. For this, you set the charge current to 1/10th of the batteries capacity. This is so because the process is only 60% efficient. Using this regime you can leave them on...
  5. WHONOES

    Battery charger/battery type NMH

    Simple answer is no. It is not that straight forward. A 12V battery can top out at up to 15 to 16V depending on the quality of the cells. You will need a power supply that can output a constant current of in your case of 200mA. That does not mean a 200mA PSU. I suggest that you have a good long...
  6. WHONOES

    electrical delay line attempt

    Purely out of interest I did a search for any terahertz product and came up with the following link. https://vadiodes.com/en/products/custom-transmitters The next link is for a document that discusses the construction and possible uses of terahertz devices...
  7. WHONOES

    electrical delay line attempt

    I think 200,000 terahertz is somewhere in the range of X-rays to gamma rays. Whilst 1 terahertz is in the range of far-infra red. i.e. from jsut under visible light through to stuff you don't want to mess with. I'm sure someone will correct me if I have got it wrong. For a transistor to switch...
  8. WHONOES

    Yamaha Stagepas 600i - Rchan keeps blowing

    See attached a schematic for a 50V 2A variable power supply. 2 will be needed if you want a ± supply. Carefully read the notes on the schematic. Edit. Seem to have got 2 copies of the schematic. Perhaps a moderator could remove one. Moderators note : removed double on request.
  9. WHONOES

    My Li-Ion Battery Charger Circuit Is Not Working As Expected

    I agree that one can learn from their failures but getting it wrong with Li-Po's can be catastrophic leading to fire and / or explosion. You really do need to understand what you are doing. Hence my comment.
  10. WHONOES

    My Li-Ion Battery Charger Circuit Is Not Working As Expected

    If as the title suggests, you should not be trying to charge Li-Ion batteries using constant current alone. The correct process uses constant current in the first stage of charging switching to constant voltage when the batteries terminal voltage is approached. This stops the cells from being...
  11. WHONOES

    LM386 Amplifier Module help

    In your diagram, you have pin 1 of the LM386 connected directly to ground presumably to set the gain to 200. According to it's datasheet, if you want a gain of 200, pin 1 should be connected to ground through a 10uf capacitor. Doing as you have will probably cause a large offset on the output.
  12. WHONOES

    Yamaha Stagepas 600i - Rchan keeps blowing

    Working on a design for current limited PSU. Watch this space
  13. WHONOES

    Taking Requests

    If I remember correctly, 3rd harmonic hum is caused by transformer induction. Have you got a metal bodied jack plug? if so, short the terminals together and plug it into your box input and see if the hum goes away. All the 0V connections must go back to one point and not be daisy chained all...
  14. WHONOES

    Taking Requests

    Good but needs to go up an octave and have some of the bass stripped off.
  15. WHONOES

    Problem understanding an answer given to a question in 'Complete Electronics Self-Teaching Guide'.

    5K looks reasonable.
  16. WHONOES

    Taking Requests

    I have another mod for the front end. Will post it soon.
  17. WHONOES

    Taking Requests

    The opening riff for Layla by Eric Clapton (God).
  18. WHONOES

    Yamaha Stagepas 600i - Rchan keeps blowing

    Current limiting power supplies are not that expensive these days particularly the Chinese ones, scuse me while I wash my mouth out. Once you get one, or two for split supplies, you will wonder how you ever managed without. Perhaps there is a project in there somewhere. Will see what I can...
  19. WHONOES

    No power RX-V681

    I think so. It is likely that just about everything has been fried.
  20. WHONOES

    No power RX-V681

    If your Yamaha has suffered a lightning strike, the best thing you could do with it is throw it away.
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