Search results

  1. audioguru2

    About file uploading

    Using the EDGE browser on Windows 10 when I clicked on "reply" it filled in the text I already posted a week or two ago. When I changed the browser to Internet Explorer then I needed to log in (again) and go through a few pages to find this thread. I will try to post an attachment, but I can't...
  2. audioguru2

    Desperate Help Needed

    Thanks for the freelancing job recommendation but I am a 70 years old government worker (I am retired with a government pension and some stocks and bonds) so I do not need more income. I do whatever I want whenever I want. :D  
  3. audioguru2

    Desperate Help Needed

    Distortion can blow out a tweeter because distortion has strong high frequency harmonics. Try feeding an input directly to the power amplifier without connecting the preamp.
  4. audioguru2

    Desperate Help Needed

    The output of a preamp will produce clipping distortion if the input level is too high. The pickup from an electric guitar produces a level much higher than an FM tuner, a CD player or an MP3 player. Most preamps for a guitar pickup use a Jfet because of its very high input impedance with a gain...
  5. audioguru2

    Power Supply1.2~30VDC, 1.5A

    The 25VAC transformer produces a peak voltage of 35.4V which is reduced to 33.4V by the rectifier bridge. Then try to turn the voltage down to 1.2V at 1.5A then the regulator will heat with (33.4V - 1.2V) x 1.5A= 48.3W which is way too much heat for it. Luckily it has thermal protection built-in...
  6. audioguru2

    Desperate Help Needed

    Nobody makes an LA4058. You got the numbers mixed up, the schematic shows a Sanyo LA4508. Your 13.6V transformer must feed the rectifiers on the Power Part of the schematic. Maybe you fed the transformer wrongly to the amplifier instead of to the rectifiers? Then probably many parts...
  7. audioguru2

    0-18V Pos/Neg 1A Current Limited

    I cannot make an attachment here with this new software when I had Windows 8.1 and Internet Explorer 11 and now I also cannot on Windows 10 and Edge or with Internet Explorer 11 even when I activated the latest JavaScript that I never needed to use on any other site. Maybe this new software...
  8. audioguru2

    diodes

    The same current flows through parts that are in series so their sequence does not matter. If your series circuits have the same parts values and the same AC input signal then their capacitors charge exactly the same. Your circuits have no input signal so nothing gets halved. A diode...
  9. audioguru2

    0-30V Stabilized Power Supply

    C9 is supposed to be 100pf, not 10pF.
  10. audioguru2

    IC doesn't fit in pcb

    The TDA7297 is not small, it has a normal size for an audio amplifier IC. Its datasheet has a recommended pcb design.
  11. audioguru2

    doubt

    Maybe an electronic high voltage generator circuit can zap the driver when he tries to adjust the drivers seat. Maybe a solenoid can be activated to lock the seat position when the car is started.
  12. audioguru2

    About file uploading

    The browser called EDGE in Windows 10 does not support plugins so I installed Java on Internet Explorer that I am now using. I still do not have a button for attachments. Anti-virus is turned on. I added Java, re-booted then checked that Java is active. I changed from Browser Edge to browser...
  13. audioguru2

    About file uploading

    I disabled my AVG anti-virus program and I still do not see an attachments button.
  14. audioguru2

    About file uploading

    In Windows 10 I turned off its popup blocker and turned off its Smartscreen Filter. Then I re-booted and checked that they are still turned off. I still do not see the attachments button. I looked at how to add JavaScript but it said to do many things I do not know how to do.
  15. audioguru2

    About file uploading

    This time I changed Windows 10 to Internet Explorer mode then I needed to log in here again. I still do not see the button for attachments. I also looked at Internet Explorer addons and millions of advanced settings but I did not see a javascript plugin. I do not know how to turn off my AVG...
  16. audioguru2

    Current monitor/sensor

    This thread has been for such a long time that most schematics are gone. I do not know what you want to do. A charger puts current into a battery from a voltage higher than the battery voltage. The current is limited or regulated. A battery is discharged by a load that draws current out of the...
  17. audioguru2

    About file uploading

    I upgraded my pc operating system to Windows 10 and its browser is called EDGE. It works fine on other forums so I will try to attach a file here. Like with Windows 8.1 and the browser Internet Explorer 11 there is no button here for me to click for me to attach anything.
  18. audioguru2

    0-30V Stabilized Power Supply

    If the resistance of R7 or its connections is intermittent then opamp U3 will have an input voltage high enough to destroy U3 and reduce the output voltage. 
  19. audioguru2

    About file uploading

    In my profile I see the box allowing me to upload my Avatar from my hard drive. But in a forum reply here I do not see a box allowing me to make an attachment. My pc automatically gets all the latest updates from Microsoft. My browser had its "popup blocker" turned on, I turned it off now and...
  20. audioguru2

    About file uploading

    I set my Avatar photo but I still do not have a box allowing me to attach anything. I will check my clock here since it it 9:53AM where I am. Let me see the time here. The clock does not show on my post, it might show later
Top