Ive taken a bit of a gamble and ordered one of these function generators ,theres a lot of horror stories ,but at the price hopefully it works out .
Seems like theres quite a few corners cut by the manufacturers to keep price down ,most of which can easily be fixed with little effort or expense
Theres been a few hickups with the programming /code in the unit as well ,and the supplier isnt offering software updates online only if the unit is returned to the factory .Firmware V3 and 3.1 are to be avoided ,V3.2 is the current offering and seems to be working ok.
Heres a link to another site where a group have started to try and reverse engineer the product due to lack of any reasonable alternative from the manufacturer when their machine bricked itself .
https://www.eevblog.com/forum/testgear/feeltech-fy6600-60mhz-2-ch-vco-function-arbitrary-waveform-signal-generator/
Theres plenty of good tips on raising the performance of the unit here too ,power supply is weak and most likely needs to be replaced or suplemented . Some have gone for a full on linear supply others have uprated the switchmode .Unit also comes without a mains earth connection,so first thing is an IEC mains socket on the back , many reported getting shocks and a quick multimeter test from the sheild of the bnc connectors to real ground revealed upwards of 100 volts .
Im thinking of trying a hybrid approach , (20va) 1:1 isolation transformer in front of the switchers just to get galvanic isolation from the mains.
Im also thinking for small tube projects a shaver transformer which supplies HT and also runs a switchmode for heaters might be worth a try ,that way you have your cake an eat it ,proper mains isolation with the efficiency of switchers .
I just wonder though,ever see the spark when a wall wart switcher is plugged in ? makes quite a crack as the big first filter cap charges , a small transformer ahead of a switcher is certainly going to limit that inrush spike ,maybe a mains rf filter between the transformer output and the switchers will help kill any RF hash trying to find its way back through the windings .
I'll be trying a few experiments in the coming weeks , but if anyone see's a good reason not to try this approach please let me know.
Thanks again.
Seems like theres quite a few corners cut by the manufacturers to keep price down ,most of which can easily be fixed with little effort or expense
Theres been a few hickups with the programming /code in the unit as well ,and the supplier isnt offering software updates online only if the unit is returned to the factory .Firmware V3 and 3.1 are to be avoided ,V3.2 is the current offering and seems to be working ok.
Heres a link to another site where a group have started to try and reverse engineer the product due to lack of any reasonable alternative from the manufacturer when their machine bricked itself .
https://www.eevblog.com/forum/testgear/feeltech-fy6600-60mhz-2-ch-vco-function-arbitrary-waveform-signal-generator/
Theres plenty of good tips on raising the performance of the unit here too ,power supply is weak and most likely needs to be replaced or suplemented . Some have gone for a full on linear supply others have uprated the switchmode .Unit also comes without a mains earth connection,so first thing is an IEC mains socket on the back , many reported getting shocks and a quick multimeter test from the sheild of the bnc connectors to real ground revealed upwards of 100 volts .
Im thinking of trying a hybrid approach , (20va) 1:1 isolation transformer in front of the switchers just to get galvanic isolation from the mains.
Im also thinking for small tube projects a shaver transformer which supplies HT and also runs a switchmode for heaters might be worth a try ,that way you have your cake an eat it ,proper mains isolation with the efficiency of switchers .
I just wonder though,ever see the spark when a wall wart switcher is plugged in ? makes quite a crack as the big first filter cap charges , a small transformer ahead of a switcher is certainly going to limit that inrush spike ,maybe a mains rf filter between the transformer output and the switchers will help kill any RF hash trying to find its way back through the windings .
I'll be trying a few experiments in the coming weeks , but if anyone see's a good reason not to try this approach please let me know.
Thanks again.
