Produce high frequency square wave

Tonyr1084

Joined Sep 24, 2015
8,003
That test circuit only tests that the comparator is working. You won't see it blinking. But it's acting like a "Sink" for the LED, that is, it's grounding the LED to turn it on.
 

MisterBill2

Joined Jan 23, 2018
19,466
From my reference manual it seems that the LM319 does not need a negative supply, but that the Vee pin can be tied to the positive supply common. As the Vee- pin is the reference for the inputs that may be the problem. So both "Gnd" pins, along with the Vee, need to tie to the V+ supply common (negative) side. My manual shows that, and claims that it can work down to +5 volts supply.
 

Thread Starter

MrsssSu

Joined Sep 28, 2021
266
View attachment 254944
This (above) is the circuit I and others used. It is similar but this one uses and LC tank (C1 and Lx) connected to the non-inverting input of the LM319.

The LM319 is good for 36 volts so ±10 volts should be fine. If you use a split supply you will not need the resistor from (in the schematic above) +5V to the + input.
Hi sir, Merry Christmas :)
I have bought the LM 319N actually and I tested it but does not really work and I have asked it in another forum here
 

jjw

Joined Dec 24, 2013
823
Hi, I have tried your suggestion and all connections are secured with all resistance values being measured using multimeter and its correct. I am still not getting any good square wave output. Feel dissapointed :)
What do you get from output? How do you test it?
 
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