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  1. R

    Padstack footprint

    Hi, The padstack is easy, 0.965mm x 0.8mm -(pad), same for the paste mask. Then the solder mask top is bigger for example 1.165mm x 1mm. This is used in Orcad to create footprint. Note: 0603 package I need the dimensions of the pad width, length between the pads (inner to inner), then the...
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    LC parallel tank circuit

    I think it is part of a mutually coupled circuit, at a particular frequency, the coupling with this and another circuit will interact. I believe that it detects proximity to another circuit and when the resonant frequencies match, they start to communicate.
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    Padstack footprint

    Orcad. I am not sure of dimensions from the datasheet.
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    Padstack footprint

    Hi I am doing a footprint for a smd 0603 resistor. Can someone clear what padstack (pad, paste mask and solder mask) and footprint dimensions i need. I believe the footprint is from the land pattern. Its my first design so please bear with me. Thanks
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    LC parallel tank circuit

    Hi, Would i be able to bring a LC circuit with a resonance that is same as the schematic to produce a mutually coupled circuit? I think this may let the signal pass to the collector (which is fed into a micro gpio pin), i am not sure but i think the pnp is then switched on (driven by the gpio...
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    LC parallel tank circuit

    I might try and simulate this in Simetrix. Thanks for your help.
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    LC parallel tank circuit

    Thanks. How could I check with the transistor in the circuit?
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    LC parallel tank circuit

    Can I ask a good way to test the circuit? If I inject a signal say sine wave 1V pk to pk at the resonant frequency or sweep it, will at resonance I will see a sine wave at collector output and either side a lower amplitude sine wave?
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    LC parallel tank circuit

    Thank you very much for your help.
  10. R

    LC parallel tank circuit

    Hi, this is the schematic.
  11. R

    LC parallel tank circuit

    Hi all, I have seen a common emitter transistor circuit with a LC parallel tank circuit connected between the base and OV. I want to ask why this would be the case and how to test it. If I found the resonance point by sweeping frequencies on the LC circuit (i think it is around 140KHz), should...
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    Inductor Coil Testing

    Hi all, I have a transponder coil 7..2mH and 125KHz resonant freq. The transponder has been tested with a LCR bridge meter. I need to design a circuit to test that is fr is at 125KHz. How can I do this? Would I need a LC parallel circuit and feed with freq generator at 125KHz? Any help would...
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    32kHz clock

    Thanks, but should i see 32kHz on input and output or only output? Should the output be larger in amplitude? Thanks in advance
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    32kHz clock

    Hi all, I wanted to ask a few questions regarding measuring a clock frequency of 32.768kHz. This is connected to a PIC micro with capacitors (15pF) to each side of the crystal, other side to gnd. Also have a series 0R resistor in the xtal in pin. 1. Capacitance probe will cause loading, so...
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    32kHz crystal

    Hi, I have noticed that a 32kHz crystal has malfunctioned i.e. not oscillating, it is cracked, what could cause this to happen? Thanks
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    LC circuit Mutual Coupling

    Hi, I have uploaded a schematic.
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    LC circuit Mutual Coupling

    Hi, yes i want to check the detect the output of this circuit when it is mutually coupled to another LC circuit. Any help would be aporeciated.
  18. R

    LC circuit Mutual Coupling

    Hi I have attached the schematic. I suppose the pnp when on, will supply the voltage to the LC tank, i want to see what happens on the collector o/p. Do I need another LC circuit (ss shown) to mutually couple?
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    LC circuit Mutual Coupling

  20. R

    LC circuit Mutual Coupling

    Its connected to OV on one side. The other side to the base of tge transistor via a 10K resistor.
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