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Recent content by Maged

  1. M

    Adder with two data registers

    Hi, The circuit seems OK provided you will connect the input clock to its drive to enter the input data. The Carry in of the 4008 need to be connected, if no data for it then ground it. never leave a CMOS input not connected. 74573,74574 are TTL 8 bit latches, also 373 and 374 are 8 bit latches...
  2. M

    Ultrasonic circuit explination

    Hello, Here is that circuit redrawn so it shows the following points. 1- the Tx transducer is connected via 1Meg ohm which will kill any output from it. It should be connected to half the supply voltage or at least a capacitor divider 2- In addition to connecting the Rx Transducer to Vcc (as...
  3. M

    Are these H-Bridges correct?

    You may use P channel MOSFETs with inverter to drive the upper MOSFETs, however the easiest way is to use L293B Chip, it provides you with 2 channels to d5rive either 3 motors bidirectionally or 4 uni bidirectionally with up to 1 A each
  4. M

    3phase AC to DC power supply

    Like Driver300 said, however 3 phase gives higher dc than input AC while single phase gives less also 3 phase gives less ripple and in full wave you will not need large electrolytic capacitor, so it is better for high voltage but for low voltages, it will cost more on the transformer. attaches...
  5. M

    sine wave inverter

    Well, the switching to generate a DC will have a constant frequency and relatively stable pulse width, this makes the ferrite transformer design easier, if you use it for the output, the pulse width will change from near zero to near 100% to form the 50/60Hz which will make it difficult with...
  6. M

    Proximity Sensor Based Circuit

    Ra,Rb,Rc as a group and Rd,Re,Rf as another one should be between the reference 3.3V and ground, the other should be from the sensor's output. Also if you use an op-amp for comparator, it may be ok however the buzzer will not sound, but if you will use a comparator like LM339, the LED's should...
  7. M

    sine wave inverter

    I think something may be changed here, the 30 KHz is not for the PWM of the 50 Hz generation, it is simply to generate that 312 VDC from the 12 V then you shape that DC at lower frequency with PWM too to form that sine wave. the transformer may be something like the one used in PC power supplies...
  8. M

    12v project help

    You may use LM2576 it is 3A Sw-Reg with only a standard coil and fast diode Its efficiency is high and will be good it works both ways i.e boost up or buck down Use LM2576-Adj to get the non standard volt you need, all in data sheet
  9. M

    Switching Mode Supply Wave-forms

    The circuit is missing 2 important things, the capacitor across the load and the feedback circuit. The coil can not increase current instantaneously, so when the switch conducts, the voltage is at the input of the coil while it is still zero at the output. The current increases gradually till...
  10. M

    how to make flip flop circuit for practice

    well, those are the basic gates meaning the simplest ones, the letters to form words if you like, any other "Gate" will be made of those, i.e. XOR gate is made of NAND and NOR etc putting 2 nands make a FF, so what other gate you may think of to use to make a flip flop?
  11. M

    SMPS boost converter help FET question

    What I would do is go like this 1)If you will be satisfy with only 10 watts of output, and efficiency of 65% then a total of 15 watt is needed from the battery (minimum) 15 W / 3 = 5 Amps, will the D cell provide that? the best quality cell will do but may heat up because AH of a battery does...
  12. M

    designing system with Flip Flops

    This is a part of an ALU that executes the command INC "increment" form a set of registers (user memories) Here we need to remember something, the register normally have input buss and output buss while the memory have common buss. with a common buss you can NOT put the result over the original...
  13. M

    simpliest isolated DC/DC converter ??

    SG3525 = LM3525 = UC3525, the data sheet has some schematics too, I did not say you cant use off the shelf transformer, but you have to find it first!! The transformer you need will be something like 8-0-8 for input and 12-0-12 for output or close to it The two "mouser" units look to me great
  14. M

    Is this Capacitive power supply truly mains isolated

    NO it is NOT, see the link, the mains go through the R1/C1 then D1 to the load side, and the neutral (bottom link) through R2/C2 the the load GND
  15. M

    simpliest isolated DC/DC converter ??

    the problem with dc-dc converter will be the transformer and its winding, if you have access to ferrite cores or transformers, I can help, but if you can not and have to use classic iron transformer, it will be bulky but yet possible. In any case you will have to wind your transformer. I...
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