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  1. gorgon

    How assembly instruction convert into binary

    If you get the 'Programmers reference manual' for the microprocessor you use, it will explain the structure and list the codes of the different instruction, The assembler is only a textparser that convert the mnemonics from text to binary values, and combine them with the relative address...
  2. gorgon

    How to vary the power delivered by a pwm signal

    PWM is an analogue signal, in the time domain. A constant ON signal is 100% power and a constant OFF is 0% power. The length of the ON pulse, relative to the period, is the amount of power between 0 and 100%. The frequency or the 1/period will indicate how fast you can change the analogue value...
  3. gorgon

    Z80 programming help

    Some 25+ years ago I used several of the Zilog chips, and they are great. Z80 both NMOS and CMOS, Z8 microcontrollers in different variants, and the SUPER8 microcontroller. I simply loved the SUPER8, a great microcontroller, the best I've ever used, but with a sadly short lifetime. Z80 is a...
  4. gorgon

    Op amp configuration with 1 resistor ?

    If you use a +1V power supply, you can generate 1mA just by putting a 1kohm resistor between the opamp and the power supply.
  5. gorgon

    Op amp configuration with 1 resistor ?

    You can't drive more than the -14.2 V from the output. To get it inside the drive range you need to reduce the feedback resistor, to, lets say 4k7 or 5k if you got that. A 1.5mA current will then give around -7.5ish V out. How you get 1mA depends on how you generate the current. If you use a...
  6. gorgon

    Please, try programming your PICs with these two codes

    Since the Counter is 'long' the Count - While loop should be at least 5 instructions long. I would think longer, but as an example say 5. With a 4MHz clock, you'll have a 1us instruction time, and a Count of 50000 should then result in a delay of 250ms, or 0.25s. This should give a blink...
  7. gorgon

    Op amp configuration with 1 resistor ?

    You should be aware that using the 100ohm feedback resistor and a 1mA input, will give you an output voltage of -0.1V. If you increase the feedback resistor to 10kohm you'll get -10V from a +1mA input.
  8. gorgon

    Op amp configuration with 1 resistor ?

    The main problem with the drawing is the +1V input. With that you can't have -10V on the output, since the opamp is not stable (both inputs at the same level.) As drawn the output should be at -15V, or at minimum possible Vout. Saying that this is a current amp is with a good portion...
  9. gorgon

    Op amp configuration with 1 resistor ?

    The LM324 can't supply your 110mA load in the first place. You also need an input resistor to make the resistor divider for the calculated amplification. In short you'll need 2 resistors to make an amplification. The Circuit you have drawn will only burn out the 324.
  10. gorgon

    ? broken part found

    It looks like 0.047uF + 100ohm x 2 in series, 250V. Values from the top and schematics from the side. TOK ;)
  11. gorgon

    overheating of the variable resistors

    What you should make is an adjustable current source, using a power transistor as regulating element. You can then use a pot to control the current, but now on the lowcurrent side of the construction. If you want to continue with the potensiometer idea, you need to use a rheostat, a wirewound...
  12. gorgon

    What is this part an where can I get it?

    For me it looks like 4.7uF / 16V
  13. gorgon

    Etching PCB with HCL and H202

    Correct, always water first. 30% HCl is around 11.2 M. H2O2 I've never used M, only %(volume).
  14. gorgon

    Etching PCB with HCL and H202

    When I did this some 40 years ago, I used both HCl and H2O2 at 30% strength. 1 part of each and 3-4 parts water as far as I can remember. Always remember to pour the acid into water, NOT the other way around.
  15. gorgon

    Someone help me with LEDS!!!

    I suppose the first thing that will happen is that the diodes will probably blow. 6A is too low for a motor that can draw 12-13A. It all depends on the load. To Control the LEDs, I agree With duke37. Use a two pole switch.
  16. gorgon

    serial communication protocol analyze

    How about to start with telling us what type of camera we are supposed to know this about?
  17. gorgon

    Damaged Bipolar Diode

    No you can't use that since it is unipolar. The 4947 was not listed any more, so I suppose it is obsolete. Farnell has some good ones. P6KE43CA from either Littelfuse or Fairchild Semi, should be in your ballpark. Farnell number 1827664 or 1467628,
  18. gorgon

    ttl <-> ttl: what can go wrong?

    You are right, you stated the voltage values for the transmitter, and I the voltages at the receiver end. I found this document referring the RS232-F standard. http://www.ti.com/lit/an/slla037a/slla037a.pdf
  19. gorgon

    Need more Program Memory

    You're welcome. The first PIC I used was the 16C54 back in 1993/4. Even with OTP it was a far cry from the old masked ROM versions from GI, in the pre Microchip times. I have other favourite brands, but the PICs comes handy at occasions.
  20. gorgon

    Need more Program Memory

    Even if this is a simple solution for you, it doesn't mean that it is like this for everyone. These chip are used in industrial devices, many of them are approved for different use and conditions. These approvals cost 10s of thousands of dollars, and the company manufacturing the devices need to...
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