SV: Re: [sdiy] MN3102 ----> CD4047 don't really need the 4007?

[karl dalen]

4046 can be used as a bbd driver with the inbuilt Xor 
gate also voltage controlled phase overlap can be achived
a thing the 4047 cant!

Controlling the 4046 from a regular NPN expo has been
shown years ago on this list, freqency range (17Mhz)
by far broader then a 4047.(expo to pin 11 or 12)

Linearity are OK for about 2,5-3 octaves wich makes it
usefull for comb filter 12 notes  octave /per volt
controll.

And no need for bufferning!

Reg
KD

--- mikei at marketbridge.ca skrev:

> MN3101/MN3102 is a very convenient chip to use and usually inexpensive. 
> Easy to turn it into a voltage-controlled clock using an expo or lin 
> current source. 
> It has built-in clock buffers so is capable of driving chips as large as 
> MN3005 with decent rise and fall times. Also has a built-in 250 nS 
> "non-overlap" time for the two clock phases which most simple drive 
> circuits ignore.
> 
> You should be able to use the CD4047 in a similar manner to the MN chip. 
> The 4047 is actually capable of running as fast as 8 MHz or so (4 MHz 
> at the outputs) in the A/DA circuit if properly tweaked. You may want to 
> buffer the 4047 outputs.
> Bye, Mike
>