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  1. autir

    Stripboard CAD

    Hello Does anyone know of any programs which take a circuit and transfer it to stripboard? The only two programs I know exist are Stripboard Designer and Stripboard Magic. The first one I have not tried, but people say it is way inferior to Stripboard Magic, which is impossible to locate. Any...
  2. autir

    breadboard drawings along with schematics

    Hi ducestaley85 Very few (if any) people post breadboard drawings along with their scematics. The main reason is that by carefully reading a scematic it is easy (for a simple scematic, at least
  3. autir

    UTP cable: diameter? Imax?

    Exactly what I needed! Thanks. Can you explain in plain English ;D what is the difference between "Maximum amps for chassis wiring" and "Maximum amps for power transmission"?
  4. autir

    PC speakers amp with TEA2025

    My amp hums even with no input. Why? What happens then? Both in the old circuit and in ST's datasheet all grounds are connected: input signal ground, output signal ground, power supply ground. So is the case in my circuit. The power supply I used for the test was an LM7805-based circuit. My...
  5. autir

    PC speakers amp with TEA2025

    I have good news and bad news. The good news is that it works. I was very surprised to listen to the music coming from the speakers. It is the first circuit I have ever built - breadboard prototypes don't count - and soldering on the stripboard was a new painful experience. I was pretty sure...
  6. autir

    PC speakers amp with TEA2025

    You mean this lovely product, Philips Contact Cleaner, they sell in electronics shops? Now it has 1001 uses  ;D One last question: Could you please check the polarity of capacitors C7 and C8? There is something suspicious...
  7. autir

    PC speakers amp with TEA2025

    I have modified the circuit according to your corrections. Now the only difference from ST's circuit are capacitors C7 and C8 which are 1 instead of 0.22 uF. In reality R1 and R2 (the only resistors in the new circuit) are a 6-pin linear potentiometer, chassis-mounted. -> Does its value -...
  8. autir

    UTP cable: diameter? Imax?

    Something less expensive? Do you have it in copper?  ;D
  9. autir

    ElCheapo PSU

    ! Won't this charging current blow the transformer's two fuses? Even if they are slowblow?
  10. autir

    ElCheapo PSU

    Relax. I didn't bite
  11. autir

    PC speakers amp with TEA2025

    Once more you are right
  12. autir

    UTP cable: diameter? Imax?

    Ok. Let me rephrase the question. I want a cable (single-clone copper wire would be better) which can support 1A (DC or RMS) and which can fit inside a veroboard-type hole.
  13. autir

    PC speakers amp with TEA2025

    The PSU powering this circuit was a linear transistor - two diodes - capacitor... Ok, C12 will be changed to 100uF. Shouldn't I replace them with two 100uF caps and omit the resistors? Fewer components are always welcome
  14. autir

    Capacitors in amplifiers: polarity or not?

    I know all this. What I asked is ...hmmmm... take for example the circuit of the preamp. Why do input C3 and output C4 have the polarity they do? When we design the next stage of this circuit, is the input capacitor of this stage supposed to have its "-" facing C4's "-", so as to form a...
  15. autir

    PC speakers amp with TEA2025

    Yes, now I see that I transferred the Vcc part of the circuit to Electronics Workbench with this error
  16. autir

    ElCheapo PSU

    audioguru,
  17. autir

    PC speakers amp with TEA2025

    The speakers of my PC started to act strangely, and I thought that the time had come to redo some solderings. I opened the speaker containing the amplifier and saw the circuit. It is based on the TEA2025 from ST. I desoldered all components and I'm about to rebuild the circuit on a new board...
  18. autir

    ElCheapo PSU

    Why/how? Also: Can anyone spare some time to explain how we calculate the values of the proper transformer for this (and a similar) circuit?
  19. autir

    veroboard pen: minor cuts and failure :'(

    By the name "veroboard" I was referring to the type of the board, not a specific brand. What is the difference, if any, between a veroboard and a stripboard?
  20. autir

    Capacitors in amplifiers: polarity or not?

    A fine answer indeed!  ;D What I've understood is that: -> We do not need polarised capacitors. We use electrolytic capacitors not because of the polarity they posess but because of their high capacitance values. Electrolytics in this case can be installed in either direction, their...
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