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  1. M

    Solenoid Current Flow

    Hello, I want to calculate the theoretical magnetic field strength in a Solenoid by discharging a Capacitor into it. So magnetic field strength B = u * N/L * I , but how do I calculate I (current) ? Lets say I have 300V 1000microfarad Capacitor, so energy stored W is 45 Joules or Watts. I =...
  2. M

    Transistor-triggered photogate

    Hello, any idea how to make this circuit work with a 6v power supply ?
  3. M

    Thyristor Help

    Hello! I have a BT151 500R rated 500V thyristor and I want to use it in forward conducting state, so I when a current flows into the gate the anode cathode starts conducting. I need to know if the anode cathode path can support a 300V Capacitor 1000uf discharge plus a coil without frying.
  4. M

    Need help testing this circuit

    Hello ! I build this Transistor-triggered photogate circuit and it doesn't seem to work. When the light between the emitter and detector diodes is interrupted it should trigger something, can someone tell where to connect a light led in order to test it ? I tried to connect a light led like in...
  5. M

    Transistor-triggered photogate

    Hello ! I need a photogate to detect a fast passing object and when the light is blocked to trigger a 300V capacitor into a flashtube. The circuit in the image does the job but I have no ideea where in the circuit to connect the capacitor and let's assume the capacitor is already charged.
  6. M

    Capacitor charging

    Hello ! I have the circuit from the picture below and a 400v 1000uF capacitor, the problem is from 200V up the charging is going very slow and it stopes at 230V, any ideas? I want to charge it at least to 350V. Thanks! image hosting 10mb limit
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