[sdiy] Odp: Re: SAW core VCO flyback time

[Steve Lenham]

Even more familiar:
http://curtiselectromusic.com/uploads/CEM_3340-3345_Long.pdf

:-)

On 28/08/2016 22:33, Ian Fritz wrote:
> Sounds familiar:
> http://ijfritz.byethost4.com/sy_cir4.htm
>
>
> On 8/28/2016 11:28 AM, Ben Bradley wrote:
>> I've designed but not yet built a triangle oscillator using a single
>> integrator and mux on the input. This uses two current outputs from
>> the exponential converter, one going to a current mirror, so there's
>> the same amount of current in both directions. The mux, driven by the
>> usual comparator with large hysteresis, switches the integrator input
>> between these two current sources. I'm not sure how a disconnected
>> current source will act when connected, but an extra switch can
>> connect the non-active current source to ground. This way the current
>> sources are always (except for switching times) connected to a virtual
>> or actual ground. Thinking another moment, a signal diode/1N4148
>> between each current source and ground, connected to forward conduct
>> when the mux switches off, may be a better solution.
>>
>> Good symmetry of course depends on the current sources being as close
>> as possible.