Products > Test Equipment
FeelTech FY6600 60MHz 2-Ch VCO Function Arbitrary Waveform Signal Generator
GregDunn:
--- Quote from: soundtec on August 10, 2018, 06:41:07 am ---On the 6600 the encoder has a push switch button ,this allows you to change the display to uHz Hz Mhz etc , its the OK button on the 6800 does that ,I wasnt sure from your post if you had figured out how to toggle Mhz/hz in the display or not .
And yes do keep posting your thoughts or possible improvements here .
--- End quote ---
:palm: Wow, do I feel like a numpty now. You're absolutely right; I assumed that feature was missing because the encoder doesn't have a push switch (the manual is a hasty conversion from the FY6600 manual, and some things are confusing). But "OK" cycles through the units very nicely with the decimal point shifting to accommodate and you can quickly enter the desired range/value. Not necessarily the procedure I would have coded but easy to work with nonetheless! Once I get accustomed to it there should be no problem. Hopefully the manual will be updated eventually to make that and a few other small details clearer.
I'd like to see a platform-agnostic interface to upload arbitrary waveforms rather than a PC-only program; that's probably do-able and would allow you to use pretty much any tool to create the data list. All my computers are Macs, but fortunately I can get by with the predefined waveforms so I'm not bothered by this for now. FeelTech have provided a pretty thoughtful list of arbs already.
soundtec:
Hz,khz etc was one of the functions I needed to refer to the manual about when I first got the 6600 so nothing to be ashamed about .
Im still only managing 11.6 volts on the +/- with the switcher ,I see the rectifier diodes on the outputs are common In 400x ,could I get a few hundreds of milivolts by using low forward drop diodes here ? or are there easier ways to increase output voltage of switchers ?
Id like to seperate both 5 and +/- onto two different supplies , but the only way I can get the opamp rails stable and with enough voltage is by using a large resistor to burn off current on the 5 volt line , in the case of a single unit ,could adding more load to the 5 volt line bring up the rail voltage ?
svetlov:
Hello Dear Friends :) which operational amplifiers are installed at the output of the generator? they are different in the models 6600 and 6800?
Thank you :)
soundtec:
Hi Svet,
Here's a link to an old post ,theres lots on the output stage to be found if you try search in this topic.
https://www.eevblog.com/forum/testgear/feeltech-fy6600-60mhz-2-ch-vco-function-arbitrary-waveform-signal-generator/1150/
I havent lifted the heatsink on my 6800 yet ,there does at least seem to be a change in output op amp package style in the 6800 ,as you will see from my post ,in the original 6600 there was a mismatch in height between the two op amps under the heatsink ,so the heatsink wasnt very effective and was on crookedly . A couple of layers of heat sink rubber pad fixes this in the 6600.
There is a brand new op amp (THS 3491)suitable for use in the 66/6800 ,only issue was compatibillity with the package/pinout ,I did read that even though its had a different package to the 3002/3095 it was still compatible .The THS 3491 can draw upto 350ma at full output ,so if you decide to try it you will need a bigger psu and output stage heatsink to get any benefits . The other possibility is to populate all three pads in the output section ,two single channel op amps and one dual ,this is easily do-able ,but output padding resistors would need to be re-arranged also.
soundtec:
In the above zip you'll find some stuff on the 66/6800 in one place ,instead of having to scan the entire post .Fremens V .5,.6,.7,schematics ,and driver ch340.
Thurlby Thandar Wavemanager 4.10 is nice package thats compatible with Fremens software ,the functionality of the program isnt hampered by not having a TTI device connected ,and theres no nag screens . Requires NI Visa runtime installed . The waveform creation allows a much better range of math functionality,including adding subtracting and multiplying waveforms together .As you create each wave type a selection of parameters becomes available ,the 'heartbeat' wave having around 10 parameters to adjust . Ive created a few interesting paterns with stairstep mixed with other waves . It will be interesting to hear how these waveforms end up sounding in the audio range . I really want to explore the possibilites of using my 66/6800 for sound and music creation in a modular type setup .
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