[HomeBrew] RE:HC 4049 Hex Buffer advice needed

Wed, 10 Sep 2003 09:52:36 +0800

Hello Cal,

The 4000 series CMOS devices have high output impedance. The output =
impedance of standard devices are approx. 5 kohm at low frequency. =
Buffer device, e.g. 4049, has somewhat
lower impedance, approx. 2~3 kohm.

Rgds,
Chin-leong, 9W2LC.

-----Original Message-----

Date: Wed, 3 Sep 2003 15:01:38 -0700 (PDT)
From: kwylow zinjanthropus <[email protected]>
To: [email protected]
Subject: [HomeBrew] HC 4049 Hex Buffer advice needed

All:
I came in contact with a digital VFO that uses an HC4049 Hex Buffer as =
its output. I would like to use this circuit as an LO for a tube mixer =
circuit. My concern is with the signal output of the 4049 and it's =
output Z. Current Vcc of this item is nominally 5-8 VDC. Something tells =
me that this may be a low Z output (but then again, I don't know). The =
grid of the mixer should be some high Z input.=20
=20
Can anyone please advise? I would appreciated the feedback. Thanks. Cal, =
n6KYR.=20