Continue to Site

Welcome to our site!

Electro Tech is an online community (with over 170,000 members) who enjoy talking about and building electronic circuits, projects and gadgets. To participate you need to register. Registration is free. Click here to register now.

Register Log in
  • Welcome to our site! Electro Tech is an online community (with over 170,000 members) who enjoy talking about and building electronic circuits, projects and gadgets. To participate you need to register. Registration is free. Click here to register now.

Recent content by Jony130

  1. J

    Can anyone help me find the ADC section on this board?

    It looks like the IC38 is this one WM8750 https://www.cirrus.com/products/wm8750/
  2. J

    About make an audio power amplifier.

    Yes, sure we can replace the bootstrap circuit and use constant current source instead. But it does not solve the problem with lack off current limitation in Q4. No, first add Re resistor into the circuit. And the value of this resistor is Re = Vd/(2*IcQ4) = 0.7V/(2 * 5.3mA) = 0.7V/10.6mA ≈...
  3. J

    About make an audio power amplifier.

    Yes I see one. Notice that the VAS current (Q4) is not limited and this would cause a big problem. So your circuit will only "protect" Q6 and Q8. This is why almost none use this type of a protection circuit. For example you can fix this by adding an emitter resistor into Q4 and two diodes...
  4. J

    Voltage to current calculations

    Ratch did you forget that the voltage gain for this circuit is negative and this is why we have a plus sign in equation vi/R1 + (R2/R1 vi)*1/R3??
  5. J

    Bridge Full-Wave Rectifier Operation

    Well you simply bought the wrong book. You should buy this one: Electronic Devices (Conventional Current Version) (9th ed) by Floyd...
  6. J

    What can be uses as an adjustable Zener?

    TL431?
  7. J

    Ferrite Bead

    Have you seen this video
  8. J

    What is voltage drop?

    But sometime a voltage drop = voltage across any individual component.
  9. J

    synchronous rectification vs diode?

    What ?? CCM - continuous current mode freewheel diode - is just a switching diode https://en.wikipedia.org/wiki/Buck%E2%80%93boost_converter
  10. J

    common mode input range for ADC

    I think I figured it out. Vcm_max = 5.3V - 1.25V = 4.05V. And 4.05V + 1.25V = 5.3V so we can full ADC range.
  11. J

    common mode input range for ADC

    Hi all , the MCP3302 data sheet says that the common mode input range VSS -0.3V to VDD + 0.3V. But what I do not understand the figure 5.8 https://ww1.microchip.com/downloads/en/DeviceDoc/21697F.pdf (page 19). Why for Vref = 1.25V the common mode range was reduced to 4.05V to 0.95V?
  12. J

    Way back to the basics. Transitor question

    wannaBinventor do you know why audioguru chosen the divide current 20 times larger than base current ?
  13. J

    Where do all the 555's go?

    Almost every bosch electric screwdriver use 555 for PWM DC motor speed control. https://obrazki.elektroda.net/69_1285747297.jpg Also in welding machine I see 555 also as a PWM for wire feed unit.
  14. J

    Power supply from power amplifier question.

    First the PSU diagram form audio power amplifier The upper part (A1 and A3) is used to power front end (65V). The lower part (A5, A7) is used to power the output stage (55V). I would like to know what's the purpose of this circuit D911/D913; C909/C911; R901/R903? Maybe they are here to...
  15. J

    Why Opamp with potentiometer?

    I have mentioned about this in my post 34. That most op-amp simulation models (model statements) incorrectly model the power-supply current. And this is why this circuit will never work in simulation program. In real life the circuit might work, but I would add emitter degeneration resistors...
See more

Latest threads

New Articles From Microcontroller Tips

Back
Top