The Well Tempered Master Clock - Building a low phase noise/jitter crystal oscillator

[justubes]

Interest List SC-cut Crystals from Laptech
- andrea_mori: 2 x 11.2896 MHz + 2 x 22.5792 MHz + 2 x 24.576 MHz + 1 x 45.1584 Mhz + 1 x 49.152 MHz
- Acko: 1 x 45.1584 MHz + 1 x 49.152MHz
- iancanada: 1 x 22.5792 MHz + 1 x 24.576 MHz + 1 x 45.1584 MHz + 1 x 49.152MHz
- babaudio : 2 x 22.5792 MHz + 2 x 24.576 MHz
- Clsidxxl: 1 x 22.5792 MHz + 1 x 24.576 MHz
- lindamar: 1 x 11.2896 MHz 1 x 22.5792 MHz + 1 x 24.576 MHz + 1 x 45.1584 MHz + 1 x 49.152MHz
- tagheuer: 1 x 45.1584 MHz + 1 x 49.152MHz
- palmito: 1 x 45.1584 MHz + 1 x 49.152MHz
- damohpi: 1x 11.2896 Mhz (or 2x if reqd.)
- Naimster: 1 x 22.5792 MHz + 1 x 24.576 MHz
- noizas: 1 x 11.2896 MHz + 1 x 22.5792 MHz + 1 x 45.1584 MHz + 1 x 49.152 MHz
- Phi: 1 x 22.5792 MHz + 1 x 24.576 MHz (Added title )
- stijn001: 1 x 45.1584 MHz + 1 x 49.152MHz
- ambrosia168: 1 x 11.2896 MHz + 2 x 22.5792 MHz + 1 x 24.576 MHz + 1 x 45.1584 Mhz + 1 x 49.152 MHz
- flowerpot: 1 x 45.1584 MHz + 1 x 49.152MHz + 2 x PCB + 1 x daughter board + 2 x DIL
- jdlvfr: 2 x 11.2896 Mhz
- tods: 1 x 22.5792 MHz + 1 x 24.576 MHz + 1 x 45.1584 MHz + 1 x 49.152MHz
- wlowes: 1 x 45.1584 MHz + 1 x 49.152MHz
- fralippo: 1 x 45.1584 MHz + 1 x 49.152MHz + PCBs
- duster1: 1 x 45.1584 MHz + 1 x 49.152MHz + PCBs
- deanoUK: 1 x 45.1584 MHz + 1 x 49.152MHz
- BDL: 1 x 22.5792 MHz
- vita : 1 x 45.1584 Mhz + 1 x 49.152 Mhz
- Malvin: 1 x 45.1584 MHz + 1 x 49.152MHz
- rlim: 1 x 22.5792MHz + 1 x 24.576MHz
-Justbes: 1 x 22.5792MHz + 1 x 24.576MHz

 

[clsidxxl]

Interest List SC-cut Crystals from Laptech
- andrea_mori: 2 x 11.2896 MHz + 2 x 22.5792 MHz + 2 x 24.576 MHz + 1 x 45.1584 Mhz + 1 x 49.152 MHz
- Acko: 1 x 45.1584 MHz + 1 x 49.152MHz
- iancanada: 1 x 22.5792 MHz + 1 x 24.576 MHz + 1 x 45.1584 MHz + 1 x 49.152MHz
- babaudio : 2 x 22.5792 MHz + 2 x 24.576 MHz
- Clsidxxl: 1 x 45.1584 MHz + 1 x 49.152MHz
- lindamar: 1 x 11.2896 MHz 1 x 22.5792 MHz + 1 x 24.576 MHz + 1 x 45.1584 MHz + 1 x 49.152MHz
- tagheuer: 1 x 45.1584 MHz + 1 x 49.152MHz
- palmito: 1 x 45.1584 MHz + 1 x 49.152MHz
- damohpi: 1x 11.2896 Mhz (or 2x if reqd.)
- Naimster: 1 x 22.5792 MHz + 1 x 24.576 MHz
- noizas: 1 x 11.2896 MHz + 1 x 22.5792 MHz + 1 x 45.1584 MHz + 1 x 49.152 MHz
- Phi: 1 x 22.5792 MHz + 1 x 24.576 MHz (Added title )
- stijn001: 1 x 45.1584 MHz + 1 x 49.152MHz
- ambrosia168: 1 x 11.2896 MHz + 2 x 22.5792 MHz + 1 x 24.576 MHz + 1 x 45.1584 Mhz + 1 x 49.152 MHz
- flowerpot: 1 x 45.1584 MHz + 1 x 49.152MHz + 2 x PCB + 1 x daughter board + 2 x DIL
- jdlvfr: 2 x 11.2896 Mhz
- tods: 1 x 22.5792 MHz + 1 x 24.576 MHz + 1 x 45.1584 MHz + 1 x 49.152MHz
- wlowes: 1 x 45.1584 MHz + 1 x 49.152MHz
- fralippo: 1 x 45.1584 MHz + 1 x 49.152MHz + PCBs
- duster1: 1 x 45.1584 MHz + 1 x 49.152MHz + PCBs
- deanoUK: 1 x 45.1584 MHz + 1 x 49.152MHz
- BDL: 1 x 22.5792 MHz
- vita : 1 x 45.1584 Mhz + 1 x 49.152 Mhz
- Malvin: 1 x 45.1584 MHz + 1 x 49.152MHz
- rlim: 1 x 22.5792MHz + 1 x 24.576MHz
-Justbes: 1 x 22.5792MHz + 1 x 24.576MHz

 

[justubes]

could someone please share,

I have looked at an aftermarket clock with multiple outputs which it is run by a 10m rubidium and a cheaper model an, ocxo. To generate frequencies, its look to have 2 standard vcxo of 22mhz and 24mhz units which would probably not have as good specs as the units in this group buy.

So why would it cost thousands for a clock, and over 10 grand for a rubidium based clock? guessing they use vcxo's inside with poorer phase noise than the clapp, butler or drisol units.

With a seperate transport and dac, is a master clock unit commonly used in recording studios that can lock 2 or more frequencies to all equipment superior to just having a good low phase noise clock in just the transport or dac alone.

A single master clock solves different frequencies and lock with less timing phase errors of seperate transport and dac, even single box players may have different frequencies running multiple clocks, in this case 2 clocks must be changed for best results.

 

[noizas]

Removed my interest for 1 x 22.5792 MHz and 1 x 49.152 MHz.

Interest List SC-cut Crystals from Laptech
- andrea_mori: 2 x 11.2896 MHz + 2 x 22.5792 MHz + 2 x 24.576 MHz + 1 x 45.1584 Mhz + 1 x 49.152 MHz
- Acko: 1 x 45.1584 MHz + 1 x 49.152MHz
- iancanada: 1 x 22.5792 MHz + 1 x 24.576 MHz + 1 x 45.1584 MHz + 1 x 49.152MHz
- babaudio : 2 x 22.5792 MHz + 2 x 24.576 MHz
- Clsidxxl: 1 x 45.1584 MHz + 1 x 49.152MHz
- lindamar: 1 x 11.2896 MHz 1 x 22.5792 MHz + 1 x 24.576 MHz + 1 x 45.1584 MHz + 1 x 49.152MHz
- tagheuer: 1 x 45.1584 MHz + 1 x 49.152MHz
- palmito: 1 x 45.1584 MHz + 1 x 49.152MHz
- damohpi: 1x 11.2896 Mhz (or 2x if reqd.)
- Naimster: 1 x 22.5792 MHz + 1 x 24.576 MHz
- noizas: 1 x 11.2896 MHz + 1 x 45.1584 MHz
- Phi: 1 x 22.5792 MHz + 1 x 24.576 MHz (Added title )
- stijn001: 1 x 45.1584 MHz + 1 x 49.152MHz
- ambrosia168: 1 x 11.2896 MHz + 2 x 22.5792 MHz + 1 x 24.576 MHz + 1 x 45.1584 Mhz + 1 x 49.152 MHz
- flowerpot: 1 x 45.1584 MHz + 1 x 49.152MHz + 2 x PCB + 1 x daughter board + 2 x DIL
- jdlvfr: 2 x 11.2896 Mhz
- tods: 1 x 22.5792 MHz + 1 x 24.576 MHz + 1 x 45.1584 MHz + 1 x 49.152MHz
- wlowes: 1 x 45.1584 MHz + 1 x 49.152MHz
- fralippo: 1 x 45.1584 MHz + 1 x 49.152MHz + PCBs
- duster1: 1 x 45.1584 MHz + 1 x 49.152MHz + PCBs
- deanoUK: 1 x 45.1584 MHz + 1 x 49.152MHz
- BDL: 1 x 22.5792 MHz
- vita : 1 x 45.1584 Mhz + 1 x 49.152 Mhz
- Malvin: 1 x 45.1584 MHz + 1 x 49.152MHz
- rlim: 1 x 22.5792MHz + 1 x 24.576MHz
-Justbes: 1 x 22.5792MHz + 1 x 24.576MHz

 

[Terry Demol]

could someone please share,

I have looked at an aftermarket clock with multiple outputs which it is run by a 10m rubidium and a cheaper model an, ocxo. To generate frequencies, its look to have 2 standard vcxo of 22mhz and 24mhz units which would probably not have as good specs as the units in this group buy.

JT, at the risk of a slight thread derailment I will address your post, apologies
to others if this is a bit off topic.
Im guessing you are referring to Antelope audio products which are dedicated to pro audio apps, as such require all WC frequencies from 44.1k to 192k.

If you take the time to down load various pdf's from their website you will see that they are using DDS (direct digital synthesis) based clocking
system which uses 1 low jitter ref clock and the various OP clock freqs are derived from this with digital synthesis.

Further to this their OCXO can be slaved (or locked) to their Rubidium master clock. It is important to remember that a Rubidium clock only has very good long term stability, ie; minutes, hours, days, years but short term phase noise (jitter) is not so good. To achieve good short term jitter there will most likely be an OCXO that is locked to the Rubidium master.

To make things even more confusing (for non tech people) they use an additional system called AFC, Acoustically focused clocking. This appears to be some type of intentionally added jitter of a spectrum that apparently has + subjective effects. Maybe it's some type of random high frequency phase noise, the only way to know is do a phase noise test on their unit.

So why would it cost thousands for a clock, and over 10 grand for a rubidium based clock? guessing they use vcxo's inside with poorer phase noise than the clapp, butler or drisol units.

As stated they have the Rubidium master, then some kind of low jitter slave, presumably an OCXO and that is the reference for the DDS circuit, which
itself probably has the AFC driven by proprietary software. There's a lot going on inside. Add the manufacturing costs, distributor / dealer margins etc etc - you can work out where the cost is.

With a seperate transport and dac, is a master clock unit commonly used in recording studios that can lock 2 or more frequencies to all equipment superior to just having a good low phase noise clock in just the transport or dac alone.

Probably not but you must remember that pro products are designed for compatibility with studios and as such require multiple functionality.
So it goes.

A single master clock solves different frequencies and lock with less timing phase errors of seperate transport and dac, even single box players may have different frequencies running multiple clocks, in this case 2 clocks must be changed for best results.

I'm not sure what you mean by phase errors. Even most DAC's will require 2 clocks for 44.1k/48k derived frequencies unless the DAC uses an ASRC like ESS Sabre.

T

 

[Eldam]

Does anyone tryed the bare Laptech crystals to have a first idea on the IanCanada clock board v1 to compare with the Crystek (with ears I mean) ?

 

[wlowes]

Great question

Or any other implementation such as the Acko S03.

 

[Eldam]

Btw is it possible with V1 clock board of IanCanada ? (crystals are soldered on the pcb ?)

I know it will be possible in the V2 to be launched soon !

As I can not affoard all the pcbs and the bom list to populate its and make myself some checks, I just ask for a simple earing benchmark if anybody does it already !

 

[clsidxxl]

Btw is it possible with V1 clock board of IanCanada ? (crystals are soldered on the pcb ?)

I know it will be possible in the V2 to be launched soon !

As I can not affoard all the pcbs and the bom list to populate its and make myself some checks, I just ask for a simple earing benchmark if anybody does it already !

With the V1 and TWTMC-DIL it's possible yes,no the crystal is not solder to the pcb,this is a adapter also

twtmc-dil partagé sur ZimageZ
TWTMC-DIL


cchd957950 partagé sur ZimageZ
adapter Ian clock

 

[Eldam]

Thanks for the input.

Anyone having both the Ian's Clocks board and the Laptech... and time as well to benchmark firstly with ears the Laptechs we received VS the Cristeks ?

Ian maybe if you had time enough to do it already ?

regards

Eldam

 

[bson]

Just a note... you may want to update post #1 to refer to post #544 instead of #394 for assembly instructions and BOM.

 

[ambrosia168]

Interest List SC-cut Crystals from Laptech
- andrea_mori: 2 x 11.2896 MHz + 2 x 22.5792 MHz + 2 x 24.576 MHz + 1 x 45.1584 Mhz + 1 x 49.152 MHz
- Acko: 1 x 45.1584 MHz + 1 x 49.152MHz
- iancanada: 1 x 22.5792 MHz + 1 x 24.576 MHz + 1 x 45.1584 MHz + 1 x 49.152MHz
- babaudio : 2 x 22.5792 MHz + 2 x 24.576 MHz
- Clsidxxl: 1 x 45.1584 MHz + 1 x 49.152MHz
- lindamar: 1 x 11.2896 MHz 1 x 22.5792 MHz + 1 x 24.576 MHz + 1 x 45.1584 MHz + 1 x 49.152MHz
- tagheuer: 1 x 45.1584 MHz + 1 x 49.152MHz
- palmito: 1 x 45.1584 MHz + 1 x 49.152MHz
- damohpi: 1x 11.2896 Mhz (or 2x if reqd.)
- Naimster: 1 x 22.5792 MHz + 1 x 24.576 MHz
- noizas: 1 x 11.2896 MHz + 1 x 45.1584 MHz
- Phi: 1 x 22.5792 MHz + 1 x 24.576 MHz (Added title )
- stijn001: 1 x 45.1584 MHz + 1 x 49.152MHz
- ambrosia168: 3 x 11.2896 MHz + 3 x 45.1584 Mhz + 2 x 49.152 MHz
- flowerpot: 1 x 45.1584 MHz + 1 x 49.152MHz + 2 x PCB + 1 x daughter board + 2 x DIL
- jdlvfr: 2 x 11.2896 Mhz
- tods: 1 x 22.5792 MHz + 1 x 24.576 MHz + 1 x 45.1584 MHz + 1 x 49.152MHz
- wlowes: 1 x 45.1584 MHz + 1 x 49.152MHz
- fralippo: 1 x 45.1584 MHz + 1 x 49.152MHz + PCBs
- duster1: 1 x 45.1584 MHz + 1 x 49.152MHz + PCBs
- deanoUK: 1 x 45.1584 MHz + 1 x 49.152MHz
- BDL: 1 x 22.5792 MHz
- vita : 1 x 45.1584 Mhz + 1 x 49.152 Mhz
- Malvin: 1 x 45.1584 MHz + 1 x 49.152MHz
- rlim: 1 x 22.5792MHz + 1 x 24.576MHz
-Justbes: 1 x 22.5792MHz + 1 x 24.576MHz

 

[hires]

Hi all,

Members concerned by Assembly Service & Parts GB have received PM.
-> I'm unabble to contact hirez69 : so please hirez69 drop me a PM or Mail.

All oscillators and PCBs have been received, Qty checked & Ok from Andrea's list.

If others members needs Parts, please fill the Form with "No Assembly Service" for Clock, D&D & DIL.
Link to the form :
https://docs.google.com/forms/d/1odqObA4PFXhxqxyqrZiAPSWgGCTsZBO19erk2LmXXHk/viewform

More to come 🙂


Regards,
Phil

Hi Phil,

you have a PM.
Thanks
hirres

 

[canvas]

Interest List SC-cut Crystals from Laptech
- andrea_mori: 2 x 11.2896 MHz + 2 x 22.5792 MHz + 2 x 24.576 MHz + 1 x 45.1584 Mhz + 1 x 49.152 MHz
- Acko: 1 x 45.1584 MHz + 1 x 49.152MHz
- iancanada: 1 x 22.5792 MHz + 1 x 24.576 MHz + 1 x 45.1584 MHz + 1 x 49.152MHz
- babaudio : 2 x 22.5792 MHz + 2 x 24.576 MHz
- Clsidxxl: 1 x 45.1584 MHz + 1 x 49.152MHz
- lindamar: 1 x 11.2896 MHz 1 x 22.5792 MHz + 1 x 24.576 MHz + 1 x 45.1584 MHz + 1 x 49.152MHz
- tagheuer: 1 x 45.1584 MHz + 1 x 49.152MHz
- palmito: 1 x 45.1584 MHz + 1 x 49.152MHz
- damohpi: 1x 11.2896 Mhz (or 2x if reqd.)
- Naimster: 1 x 22.5792 MHz + 1 x 24.576 MHz
- noizas: 1 x 11.2896 MHz + 1 x 45.1584 MHz
- Phi: 1 x 22.5792 MHz + 1 x 24.576 MHz (Added title )
- stijn001: 1 x 45.1584 MHz + 1 x 49.152MHz
- ambrosia168: 3 x 11.2896 MHz + 3 x 45.1584 Mhz + 2 x 49.152 MHz
- flowerpot: 1 x 45.1584 MHz + 1 x 49.152MHz + 2 x PCB + 1 x daughter board + 2 x DIL
- jdlvfr: 2 x 11.2896 Mhz
- tods: 1 x 22.5792 MHz + 1 x 24.576 MHz + 1 x 45.1584 MHz + 1 x 49.152MHz
- wlowes: 1 x 45.1584 MHz + 1 x 49.152MHz
- fralippo: 1 x 45.1584 MHz + 1 x 49.152MHz + PCBs
- duster1: 1 x 45.1584 MHz + 1 x 49.152MHz + PCBs
- deanoUK: 1 x 45.1584 MHz + 1 x 49.152MHz
- BDL: 1 x 22.5792 MHz
- vita : 1 x 45.1584 Mhz + 1 x 49.152 Mhz
- Malvin: 1 x 45.1584 MHz + 1 x 49.152MHz
- rlim: 1 x 22.5792MHz + 1 x 24.576MHz
- Justbes: 1 x 22.5792MHz + 1 x 24.576MHz
- Canvas: 1 x 11.2896 MHz + 1 x 22.5792 MHz + 1 x 24.576 MHz + 1 x 45.1584 Mhz + 1 x 49.152 MHz

 

[gerhard]

Interest List SC-cut Crystals from Laptech
- andrea_mori: 2 x 11.2896 MHz + 2 x 22.5792 MHz + 2 x 24.576 MHz + 1 x 45.1584 Mhz + 1 x 49.152 MHz
- Acko: 1 x 45.1584 MHz + 1 x 49.152MHz
- iancanada: 1 x 22.5792 MHz + 1 x 24.576 MHz + 1 x 45.1584 MHz + 1 x 49.152MHz
- babaudio : 2 x 22.5792 MHz + 2 x 24.576 MHz
- Clsidxxl: 1 x 45.1584 MHz + 1 x 49.152MHz
- lindamar: 1 x 11.2896 MHz 1 x 22.5792 MHz + 1 x 24.576 MHz + 1 x 45.1584 MHz + 1 x 49.152MHz
- tagheuer: 1 x 45.1584 MHz + 1 x 49.152MHz
- palmito: 1 x 45.1584 MHz + 1 x 49.152MHz
- damohpi: 1x 11.2896 Mhz (or 2x if reqd.)
- Naimster: 1 x 22.5792 MHz + 1 x 24.576 MHz
- noizas: 1 x 11.2896 MHz + 1 x 45.1584 MHz
- Phi: 1 x 22.5792 MHz + 1 x 24.576 MHz (Added title )
- stijn001: 1 x 45.1584 MHz + 1 x 49.152MHz
- ambrosia168: 3 x 11.2896 MHz + 3 x 45.1584 Mhz + 2 x 49.152 MHz
- flowerpot: 1 x 45.1584 MHz + 1 x 49.152MHz + 2 x PCB + 1 x daughter board + 2 x DIL
- jdlvfr: 2 x 11.2896 Mhz
- tods: 1 x 22.5792 MHz + 1 x 24.576 MHz + 1 x 45.1584 MHz + 1 x 49.152MHz
- wlowes: 1 x 45.1584 MHz + 1 x 49.152MHz
- fralippo: 1 x 45.1584 MHz + 1 x 49.152MHz + PCBs
- duster1: 1 x 45.1584 MHz + 1 x 49.152MHz + PCBs
- deanoUK: 1 x 45.1584 MHz + 1 x 49.152MHz
- BDL: 1 x 22.5792 MHz
- vita : 1 x 45.1584 Mhz + 1 x 49.152 Mhz
- Malvin: 1 x 45.1584 MHz + 1 x 49.152MHz
- rlim: 1 x 22.5792MHz + 1 x 24.576MHz
-Justbes: 1 x 22.5792MHz + 1 x 24.576MHz
-gerhard: 2 x 11.2896 MHz + 2 x 49.152MHz, also 10, 50, 100MHz (if avail., should be standard parts)

 

[stijn001]

Any change of the SC-cut Laptech GB going ahead?

 

[andrea_mori]

Any change of the SC-cut Laptech GB going ahead?

Just came back from vacation. Next weekend I'll start to arrange the group by collecting the orders.

Interest List SC-cut Crystals from Laptech
- andrea_mori: 2 x 11.2896 MHz + 2 x 22.5792 MHz + 2 x 24.576 MHz + 1 x 45.1584 Mhz + 1 x 49.152 MHz
- Acko: 1 x 45.1584 MHz + 1 x 49.152MHz
- iancanada: 1 x 22.5792 MHz + 1 x 24.576 MHz + 1 x 45.1584 MHz + 1 x 49.152MHz
- babaudio : 2 x 22.5792 MHz + 2 x 24.576 MHz
- Clsidxxl: 1 x 45.1584 MHz + 1 x 49.152MHz
- lindamar: 1 x 11.2896 MHz 1 x 22.5792 MHz + 1 x 24.576 MHz + 1 x 45.1584 MHz + 1 x 49.152MHz
- tagheuer: 1 x 45.1584 MHz + 1 x 49.152MHz
- palmito: 1 x 45.1584 MHz + 1 x 49.152MHz
- damohpi: 1x 11.2896 Mhz (or 2x if reqd.)
- Naimster: 1 x 22.5792 MHz + 1 x 24.576 MHz
- noizas: 1 x 11.2896 MHz + 1 x 45.1584 MHz
- Phi: 1 x 22.5792 MHz + 1 x 24.576 MHz (Added title )
- stijn001: 1 x 45.1584 MHz + 1 x 49.152MHz
- ambrosia168: 3 x 11.2896 MHz + 3 x 45.1584 Mhz + 2 x 49.152 MHz
- flowerpot: 1 x 45.1584 MHz + 1 x 49.152MHz + 2 x PCB + 1 x daughter board + 2 x DIL
- jdlvfr: 2 x 11.2896 Mhz
- tods: 1 x 22.5792 MHz + 1 x 24.576 MHz + 1 x 45.1584 MHz + 1 x 49.152MHz
- wlowes: 1 x 45.1584 MHz + 1 x 49.152MHz
- fralippo: 1 x 45.1584 MHz + 1 x 49.152MHz + PCBs
- duster1: 1 x 45.1584 MHz + 1 x 49.152MHz + PCBs
- deanoUK: 1 x 45.1584 MHz + 1 x 49.152MHz
- BDL: 1 x 22.5792 MHz
- vita : 1 x 45.1584 Mhz + 1 x 49.152 Mhz
- Malvin: 1 x 45.1584 MHz + 1 x 49.152MHz
- rlim: 1 x 22.5792MHz + 1 x 24.576MHz
- Justbes: 1 x 22.5792MHz + 1 x 24.576MHz
- Canvas: 1 x 11.2896 MHz + 1 x 22.5792 MHz + 1 x 24.576 MHz + 1 x 45.1584 Mhz + 1 x 49.152 MHz
-gerhard: 2 x 11.2896 MHz + 2 x 49.152MHz, also 10, 50, 100MHz (if avail., should be standard parts)

 

[RollE2k]

Have you solved an oven for the SC-cut crystals? I'm looking for 40MHz-range pair, but would think the AT-cut would be good enough for me. But if the is less possibility of getting AT-pair, and an oven design is avalible then its maybe better for me to change to SC-cut...

 

[andrea_mori]

If you have a stable signal generator and a scope with lo-cap. probes then you can
feed some RF into the output and watch with the scope where the loop gain fails.
The generator must be close enough to the crystal frequency, of course.

Interesting book in .pdf form, sorry, in German:
< Axtal >

and from the same author, 30 years ago:
< http://www.ko4bb.com/manuals/188.107.63.88/Extremely_low_noise_96MHz_oscillator_Neubig_1981.pdf >

P8000 and P8002 were JFETs made by TI long ago and had their 15 minutes
of glory. I still have some P8002 and measured one of them recently.
Gm is ridiculous for the current, but they can easily carry 50mA or more.
P8000 had to-220, P8002 looks like a BD138.
It is impossible to find a data sheet. TI seem to deny fatherhood.

All in all, a BF862 is a much better deal. Much better gm at less dissipation.

If you want to invest some money, Rhea's oscillator books are excellent.

Otherwise, I have written two articles on oscillator simulation.
They are at < hf downloads >.

regards, Gerhard

Hi Gerhard,

thanks for the suggestions.
Unfortunately my gear is a cheap 100MHz Rigol oscilloscope, with standard probe. An active probe costs more than my oscilloscope.

The BF862 could be interesting, 35-40 mA/V against 8-12 mA/V of the J310.

Have you any chance to simulate the circuit I posted in #630 with Ansoft Harmonica?

I'm waiting a reply from Laptech about availability of standard frequencies Sc-cut crystals.

Andrea

 

[andrea_mori]

Have you solved an oven for the SC-cut crystals? I'm looking for 40MHz-range pair, but would think the AT-cut would be good enough for me. But if the is less possibility of getting AT-pair, and an oven design is avalible then its maybe better for me to change to SC-cut...

As I said I'm just came back from vacation, so at this moment I have no news about the oven. I have found the copper tube, so I can order the PCB for prototyping.

BTW, keep in mind that I'm not sure that SC-cut crystals will work with Clapp circuit, since they have much higher ESR (around 110 ohm), so the losses in the network are greater and so we need higher gain. Maybe, for SC-cut type crystals you have to wait the Butler or the Driscoll oscillators.