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Registered Member #56972
Joined: Sat Sept 05 2015, 09:43PM
Location:
Posts: 10
I'm bulding a qcw and I would like to use the ud2.7 driver. I read of all the necessary modifcations (like bigger bus caps) but I was wondering if it was worth to add a startup oscillator. I made a simple schematic which uses a 555 timer to generate the startup signal, a johnson counter to determine after how many cycles the oscillator should stop and a few logic gates, I would like your opinion on this circuit and some advices on how to integrate it in the ud driver schematic. Quick explaination on how it works: When the interrupter is off the 4017's reset pin is pulled high, this way it doesn't start counting. When the interrupter goes on the reset signal will be 0 allowing the counter to operate. The startup signal will reach the gate driver section and will make the coil oscillate at the desired pole. Once a set number of cycles the johnson counter will stop receiving the clock signal and the gate driver section will start receiving the feedback signal. I know that the chips I've used in this schematic have different logic levels but it should be easy to fix, I would like to receive feedback regarding the concept and not the schematic itself. ]new-schematic-2.pdf[/file]
Registered Member #162
Joined: Mon Feb 13 2006, 10:25AM
Location: United Kingdom
Posts: 3140
The concept seems logical, but as you are using a 555 for the clock/carrier, why not use a 1/2 of a 556 ? then the other half can be a monostable to enable the clock astable.
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Qcw driver, initial oscillator with common logic chips
