Fried WS467

[Brian H]

One more thought.
Some homes have outlets controlled by wall switches.
Your WS467 isn't controlling an outlet where someone can accidentally plug in something like a vacuum cleaner or fan?

[dave w]

When you say power supply reactor cap, do you mean the 220uf electrolytic? 

Nope.
I am talking about the big mylar. The caps reactance at 60Hz is used to drop the voltage/current.

[pomonabill221]

That is what I thought... they are used to drop MOST of the line voltage, and the zener diode does the regulation.  The 22 ohm is also there to limit current.

[Brian H]

My soft start LM465's don't have the zener diode anymore. Made the series cap much smaller in value and raised the series resistor.
The new processor uses around 5 volts logic and as the extra current for driving the triacs gate turns on. The voltage goes down.  

[pomonabill221]

My soft start LM465's don't have the zener diode anymore. Made the series cap much smaller in value and raised the series resistor.
The new processor uses around 5 volts logic and as the extra current for driving the triacs gate turns on. The voltage goes down.  

The softstarts that I have use 2, 10 ohm 1/2watt resistors in series.  Are the resistors in yours 10 ohm?

[Brian H]

Mine have a 330 Ohm 1/2 watt and a .22uf series cap.
Sounds like another revision. 

[dhouston]

My soft start LM465's don't have the zener diode anymore. Made the series cap much smaller in value and raised the series resistor.

Interesting. You can design capacitive or resistive transformerless power supplies but I haven't seen one combining both approaches. Microchip AN954 covers both approaches.

• http://ww1.microchip.com/downloads/en/AppNotes/00954A.pdf

[pomonabill221]

Mine have a 330 Ohm 1/2 watt and a .22uf series cap.
Sounds like another revision. 

330 ohm???  Is that resistor near the edge of the board?  Sure sounds like, yet, another version of the SAME model number.... OH BOY  here we go AGAIN!!!

[Brian H]

Mine is Date Code 09J44 with the Sonix SN8P2501B Surface Mounted Controller.
One of the production runs that had reported problems of going On to 50%
I had one where the triac only conducted on the negative half of the AC waveform
Was a flaky triac as I replaced it with one from another LM465 that I had used for a SSR experimental output.
I will look at the PC Board and report findings.

[Brian H]

Neutral Pin---Fuse Wire--C3 .22uf--R1 330 Ohms 1/2W--Signal transformer-- Two 1N4004 Diodes. One to a 100uf/10v cap the other to Line pin to shunt the other half of the AC.

Also mine has the inductor coil for the outlet on the output side of the triac to line out. Not the neutral input pin to the neutral output pin like the older ones.

Silk Screen on PCB 11314A

Later tonight I will double check my notes to verify a brain malfunction has not happened. 

[pomonabill221]

Neutral Pin---Fuse Wire--C3 .22uf--R1 330 Ohms 1/2W--Signal transformer-- Two 1N4004 Diodes. One to a 100uf/10v cap the other to Line pin to shunt the other half of the AC.

Also mine has the inductor coil for the outlet on the output side of the triac to line out.  Not the neutral input pin to the neutral output pin like the older ones.

Silk Screen on PCB 11314A

Thanks for tracing that out!  YES it IS another version!  The SS ones that I have do have the choke on the triac output (hot) and not the neutral, so yours IS a later version..... hhmmmmm
Maybe they are using the two 1n4004's to create a (approx.) 3.3 volts for the processor, or are just relying on the cap/resistor/diode divider for the uP supply???

[Brian H]

The coil on the neutral was in the old before soft start with the DIP IC controllers.