1KHz Audio Frequency Reference - Page 1
Forum section: electronics / projects

author: enut11
author_rank: Super Contributor
timestamp: August 18, 2019, 06:28:56 am
content: I have a Vectron 1KHz frequency module that I want to mount in a box with 9v battery switch and output socket.Uses will include calibration of my audio test gear.MODEL: C0281-2 ?? not clearFREQ: 1KHzSER: 793242The module draws 6mA with a 12v DC supply.Output is around 1.5v RMS sine waveI have not been able to find any data on this module. What is written on the rear case is my own findings.Can anyone help on more info wrt specs, pin-outs, etcenut11

author: MosherIV
author_rank: Super Contributor
timestamp: August 18, 2019, 09:32:39 am
content: HiIn the 2nd picture, the power input is marked "+" and the 0V is marked "GND".For reference xtals it is common to provide some kind of voltage adjustment, so 1 of the pins might be a Vadjust. My guess is that is what the "4.4V" meansSome reference xtal modules also provide a Vref which can be used to derive the voltage adjustment.Try powering up the xtal from a current limited psu, set to what is written on the module 12V and 6mA.First use a dmm and probe the 3 other pins for another 12V or 5V or other voltage.Then probd the 3 pins with scope for the output.The last pin must be the Vadjust.Please consider running the output throught a buffer op-amp to protect the xtal.Depending on the application, it may also be useful to add a amplifier output stage, there are some high current output op-amps available. Or just build an amplifier stage.

author: enut11
author_rank: Super Contributor
timestamp: August 18, 2019, 09:48:17 am
content: Thanks @MosherIV.All the writing on the back is mine so many of the pins are still a mystery. Thanks for the tips on probing them.enut11

author: ArthurDent
author_rank: Super Contributor
timestamp: August 18, 2019, 12:13:15 pm
content: I suspect from what's written on the oscillator indicates that it is a TXCO and ones at that frequency were typically not adjustable. being a room temp oscillator with no oven would go with the low current draw of 6 ma. The pin near the '6 ma' is probably not connected and the pin next to the + output is the output return that could be connected to ground or not if you need a floating output.The 4.4 v pp is the output level in peak to peak voltage which if you convert to volts R.M.S. would be 1.5 volts. Try it with a variable supply and see if it will work down to 9 volts, it may not, and the output level will probably drop and maybe distort even if it does work at the lower supply voltage. The accuracy is more than any audio application would need so use it.

author: enut11
author_rank: Super Contributor
timestamp: August 18, 2019, 04:06:11 pm
content: Pin-outs marked.Produced a clean output down to 7.2vDC supply so should run off a 9v battery.Also, no output change with 1Kohm load so may have an internal buffer?Still would love to know specifications for this oscillator. Vectron website was no help.enut11

author: 001
author_rank: Super Contributor
timestamp: August 18, 2019, 04:29:59 pm
content: Quote from: enut11 on August 18, 2019, 06:28:56 amSorry for offtopBut I`m confusedIs audio gear calibrated by 1kHz signal or some music tone like 440Hz?