[sdiy] 4046 VCO
matthias.herrmann at fonik.de
Fri Jul 6 14:14:36 CEST 2018
for the thomas henry VCO we found that some brands completely failed and the VCO
was not scalable to 1V/oct. they always came short.
"The CD4046 ICs that I found to be more compatible with the design would list
the following as the VCO linearity specification:
- At 15V Operation, VCO In = 7.5V, +/-5V, R1 >= 1M: Linearity = 1%
The few CD4046 ICs that I found to be less compatible with the design did
coincidentally list the following as the linearity specification:
- At 15V Operation, VCO In= 7.5V, +/-1.5V, R1=100K: Linearity=0.5%
- VCO In= 7.5V, +/-5V, R1 = 1M: Linearity = 7%
The particular brands of CD4046 I found to tune more easily/consistently are as
- National CD4046
- Fairchild CD4046
- Motorola MC14046"
I had good experiences using the NXP part.
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