Thanks for the manuals, guys, though I appreciate you sending them I have them
all including one from the parent company. You’ll notice in the manuals that
the CSA isn’t detailed.
As Charles pointed out in a note to me, the ECG220 as a replacement could be
the issue. There is a guy online
One of the items I am having trouble modeling is a CLD, current limiting diode,
MCL1302. The CLDs are used between he base and collectors on the output stage
2n2219 / 2n2905. I swapped them on the board with no impact on the problem. I
can’t find CLDs in LTSPICE.
The other diode I can’t
A CLD is merely a JFET with the gate connected to the source.Sometimes a source
resistor may be included with the gate connected to the opposite end of the
resistor to the end connected to the source.
Bruce
On Monday, 30 January 2017 12:12 PM, Jerry Hancock wrote:
Yes, and I assume you would need an FET that acted like the CLD. I believe the
MCL1302 is a 2mA device. I doubt I’[ll get the model working, which would be
ideal.
> On Jan 29, 2017, at 3:20 PM, Bruce Griffiths
> wrote:
>
> A CLD is merely a JFET with the gate
Charles, thank you! Very helpful, as everyone has been.
> On Jan 29, 2017, at 6:38 PM, Charles Steinmetz wrote:
>
> Jerry wrote:
>
>> One of the items I am having trouble modeling is a CLD, current limiting
>> diode, MCL1302.
>
> CLDs are almost always operated in
Well, you aren’t going to believe this, but I’ve checked the circuit about 10
times now and it looks pretty good. I then used Charles advice and imported
the CCL2000 CLD. I ran the model and it swung to the negative rail to almost
the exact voltage I am getting with the real circuit of
Jerry wrote:
One of the items I am having trouble modeling is a CLD, current limiting diode,
MCL1302.
CLDs are almost always operated in saturation, so a behavioral current
source of the appropriate value should model it just fine for your needs
(spec for the MCL1302 is 2mA +/- 0.6mA -- as
Jerry wrote:
I traced the issue to a Chopper Stabilized Amp on the back of the power supply
board.
Unfortunately, the CSA has no schematic supplied. If it fails, it is to be
replaced.
I’ve been trying to reverse engineer it into LTSpice without luck.
There are two FETs, MFE3002 that cross