i am working on project which is completed by me by a circuit provided by some one , now i am moving towards its simulations for my report so as it is an analogue circuit i am using SIMULINK for simulations i have a problem that how to create custom blocks because i cannot find TL494 IC , IR2111 IC , 7812 Regulator , IRF540 MOSFET blocks iin SIMULINK , please help me out how to do this if u could provide me with video tutorial it would be easy for me to complete my work. or if can provide me with the blocks ready made would be appreciated please help me out.