[sdiy] LM13700 troubles yet again

Richie Burnett rburnett at richieburnett.co.uk
Wed Sep 20 22:59:15 CEST 2017


Drive the input less hard to reduce the distortion.  This will be at the 
cost of degraded SNR though.

-Richie,


-----Original Message----- 
From: Tim Ressel
Sent: Wednesday, September 20, 2017 8:09 PM
To: SYNTH DIY
Subject: [sdiy] LM13700 troubles yet again

Hi,

I am breadboarding the 4-Q Multiplier from EN and the 13700 datasheet,
using the 13700 in place of the 3080. What I am seeing is incomplete
cancellation due to distortion in the 13700, causing a minimum signal
out of about 100-200mV. I patched up the same circuit using a
13700-based VCA and an attenuverting mixer and got the same result:
incomplete cancellation due to distortion.

I'm disillusioned with the 13700. It has given me nothing but problems.


-- 
--Tim Ressel
Circuit Abbey
timr at circuitabbey.com

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