Continue to Site

Welcome to EDAboard.com

Welcome to our site! EDAboard.com is an international Electronics Discussion Forum focused on EDA software, circuits, schematics, books, theory, papers, asic, pld, 8051, DSP, Network, RF, Analog Design, PCB, Service Manuals... and a whole lot more! To participate you need to register. Registration is free. Click here to register now.

Register Log in

Very low frequency crystal oscillator

Status
Not open for further replies.
L

luben111

Advanced Member level 1
Advanced Member level 1
Joined
Mar 2, 2002
Messages
489
Helped
111
Reputation
223
Reaction score
107
Trophy points
1,323
Location
UK
Activity points
3,927
Hi,

I need to find some way to generate 10V to 15V sine wave voltage from 3V battery with minimum current consumption (<100uA), the load is negligible - 1Meg @ 5pf. One very attractive solution is to use the resonance of quartz or ceramic crystals and to get high voltage straight from the crystal.

The problem is that I can't find any crystal or ceramic resonators below 32KHz.

Is it possible to get such low frequency oscillators in miniature package and on reasonable price?

Thank you.

Kind regards,
Luben
 

Reviewing major crystal manufacturer's catalogs, you'll find tuning fork crystals starting from 10 or 20 kHz. Availability from stock may be a problem.

Tuning fork crystals have however limited power capacity and might be unable to handle 10 or 15V without mechanical damage.
 

How low in frequency do you want to go?
What frequency accuracy do you need?
How much distortion in the sine wave?
 

Hi,

The frequency is between 8KHz and 20KHz.

Luben
 

Luben
you might look at having two Crystal oscillators and using the difference signal.
This will at least enable the use of readily available higher crystal frequencies for your project.

Perhaps look at a tuned LC circuit at the output of the summed signal with a suitable secondary to achieve the signal voltage you are seeking

hope this might assist
Mik
 
Not sure Where or When I got it, but I have a 19.95 Khz Crystal.

So there probably are lower frequency ones also.
 

Hi,

I can't use two different crystals to get the lower beating frequency because it will increase the cost (I'll need some additional components to filter it). But it's a fresh idea - thank you for the suggestion.

Kind regards,
Luben
 

Status
Not open for further replies.

Similar threads

Part and Inventory Search

Welcome to EDABoard.com

Sponsor

Back
Top