Bipolar PI design

[Carl-NC]

Try this:

[h9361]

This is where pot values get converted into timing values:

Bool ADC_Run(void)
{
if(ADC_GetPot1() || ADC_GetPot2()) // If either pot has changed value
{
Settings.TgtDelay = ( 50 + Pot1Value) << 1; // Min = 50 (12.5us), max = 113 (28.25us)
Settings.TxWidth = ( 50 + Pot2Value) << 3; // Min = 50us, max = 305us
Settings.TxPeriod = (200 + (Pot2Value << 2)) << 3; // Min = 200us, max = 1220us
return True;
}
return False;
}​

The problem is, a minimum TxPeriod of 50us (20kHz) requires reducing everything else to fit. You would first need to drop the TxWidth down to, say, 10-15us and go from there.

Hello
Dear Carl
Can you tell me GB delay in code? Is it 5us?

[Carl-NC]

Yes

[h9361]

Yes

Dear carl,
I am re-designing your schematic, do you think i can replace a tl074 for Ic5 and Ic4?

[h9361]

Hello.
Yes, GND and -5V.

Dear sir,
About your Audio,
Can i replace tl064 with tl074?
thanks

[Carl-NC]

I am re-designing your schematic, do you think i can replace a tl074 for Ic5 and Ic4?

Can i replace tl064 with tl074?

Yes and yes.

[algan]

Hello colleagues, hello Carl. I built my bipolar detector, but it differs from yours; the input stage is the same, except I’m using an NE5534 IC. The output at pin 6 is fine, but with a 28cm coil, I get no response to a coin—though I do get a response to larger objects. Is it worth changing the 100k resistors, and is there an alternative input configuration possible after the two input pulses? Thanks.