Will this circuirt work fine if I put

a 74LS05 instead of the 74HC05? **broken link removed**

mabauti said:

a 74LS05 instead of the 74HC05? **broken link removed**

Click to expand...

Hi,
It should be OK if VCC = 5V which is normal.

Robert G8RPI.

mabauti said:

a 74LS05 instead of the 74HC05? **broken link removed**

Click to expand...

See the different between LS & HC first.Here is a link which explains...

**broken link removed**

Gayan Soyza said:

See the different between LS & HC first.Here is a link which explains...

**broken link removed**

Click to expand...

Great link! quite a lot to wade through though.
My answer of yes was based on the 4K7 pull-up resistors on the input and output if the inverter. I'd hazzard a guess that the design was originally intended for a TTL ('LS) chip as the resistors (input ones at least) would not be needed for CMOS ('HC) chips but might be for the TTL depending on the driving circuit.

Robert G8RPI.

Thank you for the advices gentlemen