Wanted: circuit diagram

[Karsten Eppert (DK4AS)]

Hi folks,

can anybody help me with a circuit diagram for a simple pulse-generator
which I can use as test-generator in order to test the function of the
KNB2? I figure 2 transistors will do, but can´t recall the rest.
73
Karsten
DK4AS
_______________________________________________
Elecraft mailing list
Post to: [hidden email]
You must be a subscriber to post to the list.
Subscriber Info (Addr. Change, sub, unsub etc.):
 http://mailman.qth.net/mailman/listinfo/elecraft   

Help: http://mailman.qth.net/subscribers.htm
Elecraft web page: http://www.elecraft.com

[Don Brown-4]

Hi

I usually just scratch on the metal case of Q22 (the collector) with a
screwdriver while holding it touching the metal shaft. This causes a random
popping that the noise blanker handles nicely. You can switch the blanker on
an off and here a big difference. If you want to build a pulse generator
there are several circuits based on a LM555 that are easy to build. I think
Radio Shack still sells 555's. Do a Googal search for National Semiconductor
and down load the 555 data sheet. There should be several circuits listed

Don Brown






----- Original Message -----
From: "Karsten Eppert(DK4AS)" <[hidden email]>
To: <[hidden email]>
Sent: Tuesday, February 07, 2006 11:51 AM
Subject: [Elecraft] Wanted: circuit diagram

> Hi folks,
>
> can anybody help me with a circuit diagram for a simple pulse-generator
> which I can use as test-generator in order to test the function of the
> KNB2? I figure 2 transistors will do, but can´t recall the rest.
> 73
> Karsten
> DK4AS
> _______________________________________________
> Elecraft mailing list
> Post to: [hidden email]
> You must be a subscriber to post to the list.
> Subscriber Info (Addr. Change, sub, unsub etc.):
>  http://mailman.qth.net/mailman/listinfo/elecraft
>
> Help: http://mailman.qth.net/subscribers.htm
> Elecraft web page: http://www.elecraft.com
>

_______________________________________________
Elecraft mailing list
Post to: [hidden email]
You must be a subscriber to post to the list.
Subscriber Info (Addr. Change, sub, unsub etc.):
 http://mailman.qth.net/mailman/listinfo/elecraft   

Help: http://mailman.qth.net/subscribers.htm
Elecraft web page: http://www.elecraft.com

[Stuart Rohre]

The standard "circuit" Ten Tec uses to test their noise blankers is a relay
wired to open its own coil circuit and then remake.  The arcing at the
contacts makes a good close by test source for this.

73,
Stuart
K5KVH



_______________________________________________
Elecraft mailing list
Post to: [hidden email]
You must be a subscriber to post to the list.
Subscriber Info (Addr. Change, sub, unsub etc.):
 http://mailman.qth.net/mailman/listinfo/elecraft   

Help: http://mailman.qth.net/subscribers.htm
Elecraft web page: http://www.elecraft.com

[Ron D'Eau Claire-2]

If your Hardware store stocks a simple buzzer or bell, they are the same
thing ready to go. Usually run off of 6 or 12 volts, ac or dc.

Why simulate the QRN with a solid-state circuit when the real thing is so
easy to produce? Hi!

Ron AC7AC

-----Original Message-----
The standard "circuit" Ten Tec uses to test their noise blankers is a relay
wired to open its own coil circuit and then remake.  The arcing at the
contacts makes a good close by test source for this.

73,
Stuart
K5KVH

_______________________________________________
Elecraft mailing list
Post to: [hidden email]
You must be a subscriber to post to the list.
Subscriber Info (Addr. Change, sub, unsub etc.):
 http://mailman.qth.net/mailman/listinfo/elecraft   

Help: http://mailman.qth.net/subscribers.htm
Elecraft web page: http://www.elecraft.com