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Registered Member #2115
Joined: Fri May 08 2009, 01:17PM
Location: Singapore
Posts: 46
Hello
I am currently making a PLL SSTC from Steve Conner's DWSSTC -
My coil is wound with 31AWG on a 11cm*25cm PVC form, and the Fres is around 300khz. Currently everything is on breadboard, but im planning to move it to some perf board soon, once I fix the circuit.
So I followed the schematic exactly, but i grounded the HEF4046 14 pin. I also change the resistors to 15k in series with a 10k pot and 22k in series with a 10k pot, and 330pf cap. for testing purpose.
Like that, the PLL and VCO is just running open loop, with the VCO's 10k pot determining the frequency. I can see the inductive and capacitive regions, and fres, and the 180* phase shift from inductive to capacitive side as I move the VCO pot, as is explained in richie's sstc site . Everything is in order, and when I hit Fres the coil breaks out a 2cm streamer (2A@35VDC).
However, this is the problem. when I remove the ground connection from pin 14, the sparks all go away and the frequency changes. There is now 2 distinct freq ranges, one is >Fres and one is <Fres. So, it abruptly jumps from ~320 khz to ~260khz. Only if I turn the pot very slowly, then it will sometimes make a momentary spark as it transitions. Its very strange and i dunno what i did wrong. This happens both when I just leave pin 14 ungrounded or if I add an antenna or secondary base CT.
Has anybody also experienced such problems and can help me? I got a 100mhz digital scope so you can see the oscillograms if you want.
Registered Member #2115
Joined: Fri May 08 2009, 01:17PM
Location: Singapore
Posts: 46
ok changed it. Now everything is working correctly and the freq locks at ~90 degree, going to 0 degree/180 degree as I raise/lower the primary. Moving the circuit to perf board and posting in project thread once complete
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