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  1. Externet

    Analog signal compression

    From what I can discern, the GAIN of the amplifier IC1a is lowered when its pin 1 output saturates Q2 with too much level on + peaks. The other half IC1b seems to do the same to - peaks with Q1, decreasing the gain of IC1a. So, both Q1 and Q2 do the same symmetrically. Low levels are...
  2. Externet

    Looking for a simple, yet interesting summer project.

    Make a sea floor crawling robot with video camera.
  3. Externet

    Noisy Neighbour Punisher!

    Just record the yellings in high fidelity (or not) , and play back full blast endlessly, speakers aimed back to them when they are home, while you go shopping a few hours.:rolleyes: No need for much equipment. A casette player set to 'endless' and your good home stereo.
  4. Externet

    Analog signal compression

    Sorry. Unable to open the file. A warning of corrupted file pops up on my compfuser.
  5. Externet

    Analog signal compression

    Sorry, have no access to that link.
  6. Externet

    Analog signal compression

    If someone calls them sustainers also, is another story. But a compressor is a compressor and works with dynamic amplitudes of a signal. Many times you will find who names something one way because do not know what exactly is. There is dozens of effects, combination and cascade of them can...
  7. Externet

    Analog signal compression

    Audio compression is a form of distortion that reduces the dynamic range. To explain, if an audio amplitude signal (music) varies from 0.1 V to 1 V has a dynamic range of 0.9V; compression can make it vary between 0.5 and 0.9V instead, where the new dynamic range is 0.4V. The level at which...
  8. Externet

    Switches and amperes?

    Sorry, Steve. I thought I had read ..." I want to buy a small on/off push button switch "... from Justin :(
  9. Externet

    to batteries specialist

    To make the battery live longer, read its manufacturer data sheet for any recommended charging voltage and current rate. If you prefer 50% of whatever be the recommended charging current, you still need the data sheet to find out how much is it. I would not exceed 10 Amperes if there is no...
  10. Externet

    Switches and amperes?

    This one should work well for you : ---> http://www.e-switch.com/product/tabid/96/productid/62/sename/p227-series-pushbutton-power-switches/default.aspx
  11. Externet

    to batteries specialist

    That SMPS circuit you designed, alter it to present 13.8 V instead of 12 V at the battery terminals and you wll not need any extra battery charger circuit. Lead-acid batteries are charged with constant voltage.
  12. Externet

    Waveform signal inversion...

    Tektronix 2465 Done, works. Workaround the IC U800, Tektronix unobtanium part 155-0241-02 Now to fit my canteen style contraption circuit within the guts, with smaller power resistors and heat sink. It does not run hot at all, and there is room for it. Much better than a dead...
  13. Externet

    Timers -- notes for the less experienced (work in progress)

    When dealing with timers, it is necessary to define the events desired. An initial pulse that can go: -Low -High Will start some timing -At application of pulse -At release of pulse And the output state will -Not change -Will go high -Will go low When the time lapse ends, the...
  14. Externet

    Waveform signal inversion...

    Hi. It is very useless now :( Plans A,B,C do not click :( Those flawed chips have a built-in epitaph to die soon, very proven. To transplant the output section of an older model oscilloscope that does not use such IC is another not too far choice. Miguel
  15. Externet

    Waveform signal inversion...

    Thanks. :) Why... because the integrated circuit that outputs the 2 horizontal deflection plates sweep signals is kaput only for that output I want to re-create from tapping the good signal and inverting it. There is no replacement IC U800. Pure Tektronix unobtanium part 155-0241-02 I...
  16. Externet

    What is this? Does it look fried?

    Look at the bottom of this schematic, a PNP and resistor, should be very similar to yours : ---> http://www.cate.com.au/download/Z8/z8vfdcounter/z8_vfd12_dc.pdf Miguel
  17. Externet

    What is this? Does it look fried?

    Transistors starting A,B are abreviated from 2SA, 2SB and are PNP. Transistors starting with C, D are abbreviated from 2SC, 2SD which are NPN. Japanese 'save ink' :rolleyes: stamping them that way. The resistor is a flameproof type to prevent fires on obviously fire prone circuits; it may...
  18. Externet

    Waveform signal inversion...

    Thanks for responding, 55pilot OK Stepping back, but not much to go... http://i588.photobucket.com/albums/ss323/Innernet/62and63.png To achieve : I have waveform "62" and need to create "63" from it. The huge span, yes, it has to be that way. It is the horizontal sweep for...
  19. Externet

    Circuit Diagram Tektronix 2211 Oscilloscope

    Unsure if the 2211 and 2213 are similar. If not, check other models that may : http://bama.edebris.com/manuals/tek/
  20. Externet

    Problems with Technics amplifiers

    Check if there is some DC at the speaker output terminals
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