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<span style="color: rgb(34, 34, 34); font-family: "Arial","sans-serif"; font-size: 7pt; mso-fareast-font-family: "Times New Roman"; mso-fareast-language: EN-IN;">Dear sirs,</span>

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<span style="color: rgb(34, 34, 34); font-family: "Arial","sans-serif"; font-size: 7pt; mso-fareast-font-family: "Times New Roman"; mso-fareast-language: EN-IN;">I have tried to build SCR model and efforts are in right direction.</span>

<span style="color: rgb(34, 34, 34); font-family: "Arial","sans-serif"; font-size: 7pt; mso-fareast-font-family: "Times New Roman"; mso-fareast-language: EN-IN;">But presently facing two problems which I need your guidance for correction.</span>

<span style="color: rgb(34, 34, 34); font-family: "Arial","sans-serif"; font-size: 7pt; mso-fareast-font-family: "Times New Roman"; mso-fareast-language: EN-IN;">1. I need a CCCS(current controlled current source) which is available in sources spice library but is not working properly.</span>

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<span style="color: rgb(34, 34, 34); font-family: "Arial","sans-serif"; font-size: 7pt; mso-fareast-font-family: "Times New Roman"; mso-fareast-language: EN-IN;">The problem is when we apply a control current at the control terminals(through +C and -C) the controlled current shouflow, but in the circuit</span>

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<span style="color: rgb(34, 34, 34); font-family: "Arial","sans-serif"; font-size: 7pt; mso-fareast-font-family: "Times New Roman"; mso-fareast-language: EN-IN;">I have built it is not flowing.</span>

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<span style="color: rgb(34, 34, 34); font-family: "Arial","sans-serif"; font-size: 7pt; mso-fareast-font-family: "Times New Roman"; mso-fareast-language: EN-IN;"></span><span style="color: rgb(34, 34, 34); font-family: "Arial","sans-serif"; font-size: 7pt; mso-fareast-font-family: "Times New Roman"; mso-fareast-language: EN-IN;">2. I need a voltage controlled switch with 4 isolated terminals 2 for control/gate and two for the controlled/output voltage.</span>

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<span style="color: rgb(34, 34, 34); font-family: "Arial","sans-serif"; font-size: 7pt; mso-fareast-font-family: "Times New Roman"; mso-fareast-language: EN-IN;">In Oscad there is a switch ANALOGSWITCH in analogxspice library but its a 3 terminal switch with 1 common terminal between</span>

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<span style="color: rgb(34, 34, 34); font-family: "Arial","sans-serif"; font-size: 7pt; mso-fareast-font-family: "Times New Roman"; mso-fareast-language: EN-IN;">input and output which is not useful for SCR modelling. I even tried with controlled limiter in the same library but its</span>

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<span style="color: rgb(34, 34, 34); font-family: "Arial","sans-serif"; font-size: 7pt; mso-fareast-font-family: "Times New Roman"; mso-fareast-language: EN-IN;">performance also is not good(whatever we apply at U1-L1 is appearing at the output though expected output is that at in terminal).</span>

<span style="color: rgb(34, 34, 34); font-family: "Arial","sans-serif"; font-size: 7pt; mso-fareast-font-family: "Times New Roman"; mso-fareast-language: EN-IN;">Waiting for Your suggestions/guidance and necessary actions on these issues.</span>

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<span style="color: rgb(34, 34, 34); font-family: "Arial","sans-serif"; font-size: 7pt; mso-fareast-font-family: "Times New Roman"; mso-fareast-language: EN-IN;">Thanking you sincerely</span>

<span style="color: rgb(34, 34, 34); font-family: "Arial","sans-serif"; font-size: 7pt; mso-fareast-font-family: "Times New Roman"; mso-fareast-language: EN-IN;">Har</span><span style="color: rgb(34, 34, 34); font-family: "Arial","sans-serif"; font-size: 7pt; mso-fareast-font-family: "Times New Roman"; mso-fareast-language: EN-IN;">ish Bhat</span>

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<span style="color: rgb(34, 34, 34); font-family: "Arial","sans-serif"; font-size: 7pt; mso-fareast-font-family: "Times New Roman"; mso-fareast-language: EN-IN;">Asst. Professor</span>

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<span style="color: rgb(34, 34, 34); font-family: "Arial","sans-serif"; font-size: 7pt; mso-fareast-font-family: "Times New Roman"; mso-fareast-language: EN-IN;">MITE Moodabidri</span>