Thanks for your reply. I have two more question. On schematic diagram SM1000 version F, two types of PPT options are available, one is just a push to talk button and second plug option is available on the SM1000 final product. Secondly, opto coupler is used in RIG interface, opto is light based switch... What is the use of this in your circuit.
Thanks & Regards Usman On Wed, Dec 30, 2020, 6:03 PM Muhammad Usman Akbar <[email protected]> wrote: > Thanks for your reply. > > I have one more question. > On schematic diagram SM1000 version F, two types of pcb options are > available, one is just a push to talk button and second plug option is > available on the SM1000 final product , fig attached below. > > Regards: > Usman > > On Tue, Dec 29, 2020, 11:30 AM Stuart Longland <[email protected]> > wrote: > >> On 29/12/20 2:58 pm, Muhammad Usman Akbar wrote: >> > I am taking about the following IC's. >> > 1. TPS54329E used in the power circuit (12-15 VDC -> 5 VDC >> > 2. STMPS2141 used in OTG USB interface >> > 3. EMIF02-USB03F2 also used in OTG USB interface >> > 4. LD3985M33R used in 5V to 3.3 V PS. >> >> Okay, so for (1) and (4)… any PSU capable of supplying the required >> current levels will do the job. >> >> You might need to identify any supporting circuitry around these parts, >> in particular the TPS54329E will have inductors and capacitors around it. >> >> Whatever part you replace the TPS54329E with, you may need to re-design >> that part of the circuit as it may require different value >> inductors/capacitors around it. An easy way out would be to switch that >> chip and surrounding parts with a 12V→5V 3A switch-mode module. >> >> As for (4), the LD3985M33R is a bog-standard 3.3V low-noise LDO capable >> of sourcing up to 150mA. >> >> Regards, >> -- >> Stuart Longland (aka Redhatter, VK4MSL) >> >> I haven't lost my mind... >> ...it's backed up on a tape somewhere. >> >> >> _______________________________________________ >> Freetel-codec2 mailing list >> [email protected] >> https://lists.sourceforge.net/lists/listinfo/freetel-codec2 >> >
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