Re: [AH] 2.0000024 MHz Top Octave Source Oscillator blown

From sam
Sent Wed, Apr 18th 2018, 15:49

The Arp Omni uses a variable inductor as part of the tuning circuit for 
the oscillator; I assume the String Performer does the same.  Here's a 
picture of the Arp part, for whatever it's worth:

https://syntaur.com/Items.php?Item=2729

Sam Mims

Syntaur




On 4/18/2018 9:42 AM, Kenny Balys wrote:
>
> My Hohner String Performer lost tuning right at the beginning of a 
> recording session yesterday :(
>
> I opened it up and the suspect part is a variable inductor:
>
> Hohner part L1= BV Nr 005837
>
> I have tracked this part down to a company called Amidon in Germany. 
> It has the following specifications:
>
> Amidon BV Nr 005837, colour code Black, Green, Brown, 5 MHz response, 
> L = 19.6 uH, Q=120 at 1MHz, Anschluß an Stift A:5 E:4, 27 Euros price
>
> Neato. I don't understand any of this.
>
> If I want to get going now, can I not just bang together a 2MHz 
> oscillator with CMOS gates?
>
> If anyone understands these things, why would a master oscillator be 
> inductor based? What benefit is it?
>
> This thing feeds the 50240 Top Octave divider.
>
> I checked my Crumar and it's master oscillator also sports an inductor.
>
> The old PAIA stuff seems to mostly use CMOS gate based master 
> oscillators so at least there is
>
> So where is the question?
>
> Ok.... has anyone replaced an inductor based master oscillator with a 
> CMOS gate based one on a top octave divider based synth. I am shortly 
> to do just that (as a band aid)... is this nuts?