From: Joerg H. <in...@jh...> - 2005-10-02 23:56:20
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Hi, Dhruv Sakalley wrote: > hi once again i have a doubt, i was not able to simulate the schematic > because of one doubt, i have attached the picture, the POT of 20k, > numbered P202 has both its pins 2 and 3 connected to Vgnd, Yes. > which is 2V > that creates a power loop, Not really. P202 simply acts as a variable resistor 0..20k to VGND in series with R220 (1k). Connecting pin2 and 3 of P202 is redundant in theory (pin3 could be left open). The reason for connecting pin2 and 3 is more safety in case of a defective wiper (at pin 2) > i cannot understand its purpose, my > simulation is not working again:( help me plz. > > Again we generate VGND from 5V using IC206 PWR, No surely not. VGND is created by IC201A PIN1. > that i suppose is TLC277 > again, a simple capacitor of 100nf is placed between AGND and VGND, what > is the difference it is creating, how is the voltage level reduced in > this module from 5V to Vgnd(2V)...kindly explain. The 100nF capacitor is just a power supply bypass capacitor. It does not create VGND from +5V/2. Regards, Joerg |