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  • 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 mdorian

  1. M

    Modifying a spy microphone for leopard conservation

    You're right , it's a mistake supply voltage is 3V and consumption current 2mA. Unless you really have some skills for electronic circuits I would stick to the first option. This one is only a recording module , you will need to attach a microphone , an low signal amplifier and a voltage...
  2. M

    Modifying a spy microphone for leopard conservation

    160 hours is for a 600 mAh zinc-air battery . The same size silver-oxide cell have a capacity of 200 mAh , an alkaline battery 150 mAh. The zinc-air battery have a flat voltage of 1.28V. I don't think the voltage was the reason , the capacity is slightly higher on silver-oxide cells that looks...
  3. M

    Modifying a spy microphone for leopard conservation

    Mea culpa for the reading but "some of us" are missing the fact that a g13 zinc-air battery has the same capacity (600mAh) as one AAAA battery. The capacity needed is 3 or better 4 time higher around 2000 mAh , that would be 9 or 12 AAAA batteries each at least 7g , to much for the...
  4. M

    Modifying a spy microphone for leopard conservation

    Hi K Two AA alkaline batteries in parallel will have have around 50 g weight and 4000 mAh capacity (the battery you use has at most 700mAh) , it should be enough. Take care if you are in a rainy environment , the device is for indoor use you should protect it somehow in a protective case. Do...
  5. M

    LED Reverse Polarity detector with buzzer indicator

    Yes you can. Search google for candela to lux calculator. Mcd is enough if the source is close. Your point is to see if the LED are lighting is it?
  6. M

    Trouble with multiple voltage dividers

    1) SHDN pin has an internal pull-up resistor so you need to pull it down. The way the diodes are connected is impossible to do that. In this configuration the regulator is always on. 2) In the documentation states that the regulator is off for SHDN less than 0.4V but there is no information for...
  7. M

    Trouble with multiple voltage dividers

    Diver300 is right for the main issue. The regulator is always on because the diodes are in the wrong way, the regulator module can be switched off only by pulling low the SHDN pin. Why such a complicated divider, only three resistors are enough. Tough , I don't think that switching off on low...
  8. M

    Need Help with Nested Do Loops using varaible in PIC Assembly

    Hi , why don't you use macros? For example: Set color1=green Set color2=blue call Transit Set color1=blue Set color2=red call Transit can be written: ; create a macro setcolor macro c1,c1 Set color1=c1 Set color2=c2 call Transit endm ; use it setcolor green, blue setcolor blue,red if you...
  9. M

    RS485 assistance please

    In both cases you don't need a 13Amps power line ,think in power units , how much power needs a terminal for example a 5V / 100mA terminal uses 5V*0,1A = 500mW , for a combined module terminal+ AC230V to 5VDC power supply the power required is 500mV + losses which are about 20% , total 600mW...
  10. M

    ac frequency measurement with isolation

    Loose the 1k resistor , use only rectifier diode ,100k resistor , optocoupler because the optocoupler is current driven. If still doesn't work ,in the processor side must be a pull-up resistor , check if your Current Transfer Ratio of the optocoupler is sufficient. Some have CTR = 1 or less and...
  11. M

    PIC Charge pumping?

    Yes use-it like any led matrix , column1 > Vdd , light the selected LEDs by lines to GND, a small delay, column 1 >GND , column 2 > Vdd and so on . I didn't put the limiting resistors due the lack of space on the sheet, put four resistors , one on each row . You can use polarised capacitors...
  12. M

    PIC Charge pumping?

    Pin B will have 6 V on it higher than Vdd+0.6. Multiplexed? Why not?
  13. M

    Looking for a student to help with a project

    Not much to do without any information on the remote. Can you send at least a picture of it , the model number of your exercise machine maybe somebody knows what controller is used or to contact a service center that might help? A picture of the inside circuit (both sides) of the remote would...
  14. M

    RS485 assistance please

    The standard for Category 5 cable specifies a maximum length of 100m I don't know the reason but you can find cables better suited for RS485 network , search your local distributors for RS485 cable. For 12amps you need at least a 3 square mm section cable and allot of trouble with high current...
  15. M

    PIC Charge pumping?

    You can use this circuit if you need only one led. Use timer interrupt and toggle the pin to power the led. For the circuit you describe the voltages on the pins will exceed the maximum allowed , see the data sheet.
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