Author Topic: FeelTech FY6600 60MHz 2-Ch VCO Function Arbitrary Waveform Signal Generator  (Read 549183 times)

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Offline RainerB

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I build a linear PSU for my FY6800 with some addons:

-  opto isolated USB Interface (4 pol connector with 5V for front board) (CH340G)
- 10 MHz OCXO
- 10 MHz distributor with 2 isolated sine wave outputs  (AD8055)
- 50 MHz output for fpga  (NB3N502)
- 6 pol connector for external controller board (Blackpill) (with digital poti and reference voltage for OCXO)


Two ldo regulators LM2941/LM2991 with +/- 13V output support the main board. Both can be disabled for power saving (future option).
A DC/DC converter generates 6V for 3 5V LDOs (TLV76750) :
1. Front board and optional controller
2. Main board (can be disabled for power saving)
3. OCXO and 10 MHz distributor (can be disabled for power saving)

The external controller is able to count the 10 MHz pulses with the help of 1PPS pulses and generate a controling voltage for the OCXO.
Option :
In future the external controller should drowngrade the front controller to a display and keyboard unit and take over current control job of the front controller.

This version works but has some mechanical bugs and minor electronical issues.

Therefore I'm working on version 2.0 at the moment:

- Fixing mechanical bugs
- Move the voltage reference and the  I²C controled digital eeprom potentiometer from controler board to the PSU board.
(After intial calibration the external controller can be removed )
- use SMA connectors for 10 Mhz and 50 MHz signals.
- add expansion connectors ?

Any comments welcome.
Regards
Rainer


 
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Offline Labrat101

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Quote
I build a linear PSU for my FY6800 with some addons:

Welcome.
This looks very nice .. you made the PCB as well as it looks made to perfection .
The layout looks nice well thought out ..
Do you Have the circuit diagram ?   :-+
"   All Started With A BIG Bang!! .  .   & Magic Smoke  ".
 

Offline supertrabuco

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I build a linear PSU for my FY6800 with some addons:

-  opto isolated USB Interface (4 pol connector with 5V for front board) (CH340G)
- 10 MHz OCXO
- 10 MHz distributor with 2 isolated sine wave outputs  (AD8055)
- 50 MHz output for fpga  (NB3N502)
- 6 pol connector for external controller board (Blackpill) (with digital poti and reference voltage for OCXO)


Two ldo regulators LM2941/LM2991 with +/- 13V output support the main board. Both can be disabled for power saving (future option).
A DC/DC converter generates 6V for 3 5V LDOs (TLV76750) :
1. Front board and optional controller
2. Main board (can be disabled for power saving)
3. OCXO and 10 MHz distributor (can be disabled for power saving)

The external controller is able to count the 10 MHz pulses with the help of 1PPS pulses and generate a controling voltage for the OCXO.
Option :
In future the external controller should drowngrade the front controller to a display and keyboard unit and take over current control job of the front controller.

This version works but has some mechanical bugs and minor electronical issues.

Therefore I'm working on version 2.0 at the moment:

- Fixing mechanical bugs
- Move the voltage reference and the  I²C controled digital eeprom potentiometer from controler board to the PSU board.
(After intial calibration the external controller can be removed )
- use SMA connectors for 10 Mhz and 50 MHz signals.
- add expansion connectors ?

Any comments welcome.
Regards
Rainer


Hola, es un proyecto muy interesante, sobretodo los conectores y el control externo.

En un FY6900 seria interesante un proyecto semejante? Y sobretodo cambiarle la mini-fuente pulsada por una linial 5V, 1,5A?
Saludos y gracias
« Last Edit: July 25, 2020, 04:38:44 am by supertrabuco »
 

Offline RainerB

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Re: FeelTech FY6600 60MHz 2-Ch VCO Function Arbitrary Waveform Signal Generator
« Reply #2203 on: August 17, 2020, 06:39:20 am »
@Labrat101
@Attached are the shematics of version 2.0. (Some resistor values will be modified during first tests)

An eeprom poti for the OCXO voltage and an I²C IO expander are added on the board
I replaced some regulators with THT version to save space on the board and use a heat sink.
I add some sma connctors for HF signals.
Mechanical problems are fixed. (hopefully)

ToDo:
I have to add a connector for controller driven fan.

@ supertrabuco
Yo no hablo español

Not sure what you want to say. Google translator doesn't really help.

 
 
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Offline Labrat101

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Re: FeelTech FY6600 60MHz 2-Ch VCO Function Arbitrary Waveform Signal Generator
« Reply #2204 on: August 17, 2020, 10:56:49 am »
@Labrat101
@Attached are the shematics of version 2.0. (Some resistor values will be modified during first tests)

An eeprom poti for the OCXO voltage and an I²C IO expander are added on the board
I replaced some regulators with THT version to save space on the board and use a heat sink.
I add some sma connctors for HF signals.
Mechanical problems are fixed. (hopefully)

ToDo:
I have to add a connector for controller driven fan.

@ supertrabuco
Yo no hablo español


Very impressive  you have given  a lot of thought into this .
 I Have found another Bug in my FY6800 and its the Cyclone chip .. I still can't get the jitter to hold stable . so I ran some test on the Cyclone vi and its has some faults
ie .. Its ether a fake or a reject version . From reading the Cyclone manual it has a internal DAC control on the input were the xtal enters . there are 4 inputs and are hardware
enabled .
 I enabled the pin and added another xtal as an experiment . it fails the test . also all the Jitter and frequency control of the cyclone is out of sinc on my chip.
 Which means the chip is not original . I don't know if this is the case with all the FY68.. or just a few .
  The original Cyclone chips do not have this problem .. I should have checked this earlier and not chased the rabbit down the hole .
 I guess I should have realized this.  :palm: :palm: How can they produce this unit with high quality or original chips for $80 and make a profit   :palm:

So I am going to buy the UNI-T  UTG962  which is far superior and I have not found any one who can say anything bad .. Other than it Just works out the box 

 If your project corrects some of the problems your chip maybe be a better version.  :-+

 Have fun and keep up the good work .  :-+
 :popcorn:
"   All Started With A BIG Bang!! .  .   & Magic Smoke  ".
 
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Offline RainerB

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Re: FeelTech FY6600 60MHz 2-Ch VCO Function Arbitrary Waveform Signal Generator
« Reply #2205 on: November 02, 2020, 01:13:40 pm »
Version 2 is now ready.  The LDO's deliver 14V DC ( AC Input >=  200 V ) .
The isolated USB interface worked.
Ajusting of the OCXO with an external Controller and 1PPS from GPS worked.
My FY6800 has no internal frequency offset.
An ajusted TR5212  showed 10.000.000,0 Hz for the readward isolated 10 Mhz Outputs and for Output 1/2 when set to 10 Mhz.
If anybody is interessed in an empty pcb please let me know. I have 4 more here and no use for them.

Now I will add a pcb with an STM32F411 Blackpill  for adding some features :
- Fan controll
- OCXO ajusting with GPS
- Some Ham Radio functions e.g.:https://hamprojects.wordpress.com/2018/10/21/fy-6800-generator-as-beacon/
...

(Of course my modifications didn't fix the 4ns bug) 
Regards
Rainer

 
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Offline RainerB

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Re: FeelTech FY6600 60MHz 2-Ch VCO Function Arbitrary Waveform Signal Generator
« Reply #2206 on: November 02, 2020, 01:16:56 pm »
I created a new backside with Freecad. The code is attached.

Regards
Rainer
 
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Offline Labrat101

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Re: FeelTech FY6600 60MHz 2-Ch VCO Function Arbitrary Waveform Signal Generator
« Reply #2207 on: November 02, 2020, 07:01:25 pm »
Wow very nice work.

I abandoned my FY68** . as a total waste of Time . So I Locked it at 40Hz & fitted transistor to the output
 So it is now a 40Hz Cmos pulse Med Strobe . For my wife who suffers from dementia .
 At this stupid low frequency the jitter does not affect the daylight LED strobe .
 
   I have now the UTG962 works without fault without any jitter . Just love it .

All the best and Good luck .
 :popcorn:
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Offline battlecoder

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Re: FeelTech FY6600 60MHz 2-Ch VCO Function Arbitrary Waveform Signal Generator
« Reply #2208 on: November 02, 2020, 08:22:28 pm »
@Labrat101
@Attached are the shematics of version 2.0. (Some resistor values will be modified during first tests)

An eeprom poti for the OCXO voltage and an I²C IO expander are added on the board
I replaced some regulators with THT version to save space on the board and use a heat sink.
I add some sma connctors for HF signals.
Mechanical problems are fixed. (hopefully)

ToDo:
I have to add a connector for controller driven fan.

@ supertrabuco
Yo no hablo español

Not sure what you want to say. Google translator doesn't really help.

Wonderful job. Looks like a killer replacement for the puny supply that comes inside and I would definitely love to upgrade my FY6600 with something like that.

Btw, what @supertrabuco said is "Pretty interesting project. Particularly all the connectors and external control". Then he asks if it would be possible to do the same for the FY6900, and replace the small switching supply for a linear 5V, 1.5A one.
 

Offline Labrat101

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Re: FeelTech FY6600 60MHz 2-Ch VCO Function Arbitrary Waveform Signal Generator
« Reply #2209 on: November 02, 2020, 10:17:28 pm »
Quote
@ battlecoder

Wonderful job. Looks like a killer replacement for the puny supply that comes inside and I would definitely love to upgrade my FY6600 with something like that.

Btw, what @supertrabuco said is "Pretty interesting project. Particularly all the connectors and external control". Then he asks if it would be possible to do the same for the FY6900, and replace the small switching supply for a linear 5V, 1.5A one.
The FY66 is upgradable
The FY68 /9  the only 2* real upgrades that would be valid  would be .
A)  Replace the Cyclone chip .  or (B)
B)  Fill with cement paint it a cool colour. Makes a great Door stopper .
*optional use as is .
« Last Edit: November 02, 2020, 10:34:20 pm by Labrat101 »
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Offline Labrat101

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Re: FeelTech FY6600 60MHz 2-Ch VCO Function Arbitrary Waveform Signal Generator
« Reply #2210 on: November 03, 2020, 08:17:06 am »
@ battlecoder

This might interest you this link.
Its a comparison of several AWG and the UTG962 & Rigol & Tek etc . Its Long and full.

https://www.element14.com/community/groups/roadtest/blog/2020/05/17/tektronix-afg31052-verification-tests
« Last Edit: November 03, 2020, 09:19:55 am by Labrat101 »
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Offline de_light

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Re: FeelTech FY6600 60MHz 2-Ch VCO Function Arbitrary Waveform Signal Generator
« Reply #2211 on: November 05, 2020, 09:32:43 am »
Received a FY6900 today. Opened it up to find a v1.9 board.
They seem to have replaced the Cyclone branding on the FPGA with a "FEELELEC PRO 1941" branding  :wtf:

Edit for a pic

« Last Edit: November 05, 2020, 11:45:40 am by de_light »
 

Offline Labrat101

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Re: FeelTech FY6600 60MHz 2-Ch VCO Function Arbitrary Waveform Signal Generator
« Reply #2212 on: November 05, 2020, 11:35:16 am »
That Just confirms what I Previously have said . Thanks.
 Total conformation that the Cyclone Chip was a Fake ..
       Maybe Intel pressed charges against them for using there Brand name.  :-DD.

  How well does the Pro 1941 chip work ?
 (typo error correction  1.7.*  The number was blurred ) 
  Sorry No Bad Feeling .
« Last Edit: November 05, 2020, 08:08:05 pm by Labrat101 »
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Offline de_light

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Re: FeelTech FY6600 60MHz 2-Ch VCO Function Arbitrary Waveform Signal Generator
« Reply #2213 on: November 05, 2020, 11:43:28 am »
That Just confirms what I Previously have said . Thanks.
 Total conformation that the Cyclone Chip was a Fake ..
       Maybe Intel pressed charges against them for using there Brand name.  :-DD.

  How well does the Pro 1941 chip work ?
     BTW Also my Fy68 had also had v1.9v board .
  Sorry No Bad Feeling .

If you tell me an idiot's guide to testing it, I shall do my best! My demands for a function generator aren't strenuous - purely hobbyist usage for repairing radios, driving MOSFETs etc
 

Offline de_light

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Re: FeelTech FY6600 60MHz 2-Ch VCO Function Arbitrary Waveform Signal Generator
« Reply #2214 on: November 07, 2020, 10:45:12 am »
I have tried to capture some images for you. Please bear in mind I am a beginner and rather cack-handedly probed the BNC centre prin output from the FY6900 with a short ground wire/spring touching the outer shell. It is NOT terminated in a 50 ohm resistance (Rigol DS1054Z)

First image is an 11 MHz square wave output, 5VDC p-p. Second is with dots and 1s persistence.

« Last Edit: November 07, 2020, 10:47:45 am by de_light »
 
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Offline Labrat101

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Re: FeelTech FY6600 60MHz 2-Ch VCO Function Arbitrary Waveform Signal Generator
« Reply #2215 on: November 07, 2020, 02:10:14 pm »
If you use the probe directly it is already matched to the scope 50 \$\Omega\$.
Not Bad I have seen a worse . Your scope bandwidth is 50Mhz unless you have done an upgrade .
11Mhz square is at the upper end of your scope's limitation .
 So you wont see the jitter but just that thicker line .
 Try @ 3Mhz or Less square should be more in the bandwidth and set the probe to X10 .
 But by the width of that rise is properly 4ns +-

Rule of thumb you need a scope at least 5 to 10 time the Bandwidth of the Frequency required to see.
 There are other people on this forum  better at explaining this reason .

 :popcorn:
 enjoy
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Offline mawyatt

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Re: FeelTech FY6600 60MHz 2-Ch VCO Function Arbitrary Waveform Signal Generator
« Reply #2216 on: November 07, 2020, 03:01:03 pm »
The frequency of a squarewave has nothing to do with the edge rise and fall time, which is essentially independent of the waveform frequency. You need a scope rise time of better than 1/5 the measured rise time according to Tektronix, which using the usual 0.35/BW 1st order model for lower BW scopes would place the required scope BW of greater than  5*(.35/tr), or >175MHz for a 10ns rise time.

https://www.mouser.com/pdfdocs/Tektronix12_things_to_consider1.pdf

The reason for this 1/5, or 5X better scope rise time mentioned by Tektronix is that the scope and DUT rise time are uncorrelated and thus follow the effective "system" rise time as the usual tr-system = sqrt[(tr-scope)^2 + (tr-DUT)^2], so a 5X better scope tr only causes a 2% measurement error if I did my math correctly.

Anyway, hope this helps.

Best,   
Curiosity killed the cat, also depleted my wallet!
~Wyatt Labs by Mike~
 

Offline de_light

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Re: FeelTech FY6600 60MHz 2-Ch VCO Function Arbitrary Waveform Signal Generator
« Reply #2217 on: November 07, 2020, 07:08:11 pm »
Scope is unlocked to 100MHz and probe set to 10x
Waveform at 3MHz

 
« Last Edit: November 07, 2020, 11:48:31 pm by de_light »
 

Offline radiolistener

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Re: FeelTech FY6600 60MHz 2-Ch VCO Function Arbitrary Waveform Signal Generator
« Reply #2218 on: November 07, 2020, 11:48:30 pm »
First image is an 11 MHz square wave output, 5VDC p-p. Second is with dots and 1s persistence.

if someone interested, here is the same 11 MHz 5 Vpp square wave taken from PSG9080 generator through 1 meter RG58 cable.
1) 1 MOhm input mode
2) 50 Ohm input mode
3) fall edge of the first cycle after trigger and rise edge of the second cycle after trigger (delay 70 ns after trigger)
4) rise edge of the second cycle after trigger with max oscilloscope resolution (2 ns/div, delay 70 ns after trigger)

jitter is about 0.6 ns peak-to-peak

I think amplitude error is due to to oscilloscope response flatness, because I tested PSG9080 with logarithmic detector and it's response is pretty flat up to 50 MHz and my multimeter shows pretty precise amplitude at low frequency (at 1-100 kHz).
« Last Edit: November 07, 2020, 11:53:16 pm by radiolistener »
 

Offline Labrat101

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Re: FeelTech FY6600 60MHz 2-Ch VCO Function Arbitrary Waveform Signal Generator
« Reply #2219 on: November 08, 2020, 09:06:05 am »
Hi .   @radiolistener
That's a Nice square wave with a low jitter.  :-+
 The PSG9080 is better built .
 All the FY series suffer from same old problems. 
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Offline RainerB

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Re: FeelTech FY6600 60MHz 2-Ch VCO Function Arbitrary Waveform Signal Generator
« Reply #2220 on: November 11, 2020, 08:16:26 am »
I'm plaing with fremen67's Bluepill Code V0.82.
An ILI9341 Display and the serial PC connection worked.
The keypad doesn't really worked, not sure if this version support (all) keys.
The PB2 Pin is not available on the Bluepill. Can anybody give me some additional information about the bluepill version?
I send fremen67 a pm a few days ago, but didn't got any feedback yet.

Thanks and regards
Rainer
 

Offline mnementh

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Re: FeelTech FY6600 60MHz 2-Ch VCO Function Arbitrary Waveform Signal Generator
« Reply #2221 on: November 26, 2020, 03:38:33 pm »
Considering that the FY6x00 are all available right now within a few dollars of the UTG 9x2, at around US$100 (the days of the $40 FY6600 are long gone), and only aboot $75 less than the PSG8090 even with "Black Friday" sales, is the PSG8090 now the best bang/buck? 

I like the form factor of the UTG 9x2, as it would fit under my scope with the bail down (pretty sure that's why these were made this way); but it is pretty hard to make even a ballpark evaluation of these 3 families of "Chinesium Cheapies", except that the FY6900 seems to be pretty roundly disliked as a downgrade from previous versions.  :P

One thing that would make my decision easier... can the 9x2 be easily modded with an external +/-15V supply? I mean, without just munging the eff out of the board...?

mnem
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Offline mnementh

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Re: FeelTech FY6600 60MHz 2-Ch VCO Function Arbitrary Waveform Signal Generator
« Reply #2222 on: December 05, 2020, 04:41:29 pm »
Pulled the trigger on a UTG 962 from bang-em-good; was able to burn a few affiliate points and saved a few dollars. Might be here before X-mas; we'll see how it fares then.

mnem
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Offline Falk

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Re: FeelTech FY6600 60MHz 2-Ch VCO Function Arbitrary Waveform Signal Generator
« Reply #2223 on: December 22, 2020, 10:26:38 am »
To whom it may concern.

https://www.mikrocontroller.net/articles/FY6900

Sorry, only in german.

Njoy
« Last Edit: December 22, 2020, 10:30:55 am by Falk »
 

Offline cepsbow

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I really appreciate the efforts here guys.  :-+ I got my FY6600 while they were on sale, and have been steadily modding it as I went. Before I went into the FP, wanted to know if there is access to the source for the mcu and whatnot? And can you flash this over the stock micros firmware? For information my FY6600 came with version 3.3 hardware and a FEELELEC PRO FPGA. I need to pour over the ICs and match them up to the models you guys posted. Has anyone heard from fremen lately?
 


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