Some ic's are not available in Pakistan. Need help.

[ezzan]

Sir I wanted to ask you if you can help us on Chaotic Pulse Position Modulation we have made our circuit but we are having grave issues with the ic's. Our circuit is little bit complicated, and some ic's are available in Pakistan. Semester will be completed in December, and we have to submit that complete circuit before the Exams. Please reply me if you can help me regarding this topic.

[Mahmoud_W]

Hi Ezzan,

I reviewed the circuit you attached. The only components that are missing in Multisim's component database are:

- SMP04EP Sample and Hold Amplifier. You can find a Spice Model for it in this link and create your own component.
http://www.analog.com/en/specialty-amplifiers/sampletrack-and-hold-amplifiers/smp04/products/product...

- SN74LS123 monostable multivibrator. SPICE models are not available by the manufacturer but you can replace by the generic component CD4538BCM in Multisim's library for your simulation.

I don't know about components availability in the market, but my advice to you is before you start designing your circuit to make sure the parts you are going to use or replacements for them are available in the market unless you are going to stop at the simulation stage and not implement it in hardware.

Good Luck,

Mahmoud W

National Instruments