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cupoftea reacted to en.OFweek's post in the thread Carbon monoxide sensor for garage. with Like.

That's very good!

Tuesday at 6:57 PM
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cupoftea reacted to danadakk's post in the thread Carbon monoxide sensor for garage. with Like.

MQ7 is not a low power solution, primarily because of its heater :

Tuesday at 6:57 PM
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cupoftea reacted to FvM's post in the thread Carbon monoxide sensor for garage. with Like.

And not CO selective, as stated. There are many electrochemical home CO sensors on the market (supplementing smoke alarms), long life (>...

Tuesday at 6:57 PM
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cupoftea reacted to D.A.(Tony)Stewart's post in the thread Continuous output current (solar charger) with Like.

It depends on the size in uF of the bipolar cap and Irms rating vs cost. The large kW DCDCs are forward converters, or 8kW LLC or more...

Sunday at 10:57 AM
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cupoftea replied to the thread Continuous output current (solar charger).

And if SEPIC done with a coupled inductor, then the RMS current in the coupling capacitor is very much lower. But can you be bothered...

Saturday at 7:27 PM
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cupoftea replied to the thread Bode plot.

The Y caps help with B field aswell...because they re-route the disturbance currents such that those disturbance currents do not flow...

Saturday at 6:57 PM
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cupoftea reacted to kd502's post in the thread Probing and scoping MegOhm circuits? with Like.

Don't know application of this circuit, but it can detect pulses <300nA all circuits with this sensitivity are sensitive to external...

Saturday at 6:51 PM
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cupoftea replied to the thread Bode plot.

yes because it is common mode noise that you are fighting, and this doesnt show on the scope. 1743270056 Another good way to get low...

Saturday at 5:37 PM
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cupoftea replied to the thread Bode plot.

no sorry i meant across the transformer PRI to SEC...just very low value. Say 100pF

Saturday at 4:53 PM
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cupoftea replied to the thread Bode plot.

Looks good...since your noise abatement procedures seem to give good results...why not go further and do more noise killing...eg...

Saturday at 4:02 PM
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cupoftea replied to the thread Continuous output current (solar charger).

So basically you want a buckboost type thing to go from solar to batt with output currnt control(?) Easy cheap way is to just use...

Saturday at 3:42 PM
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cupoftea replied to the thread System Transfer Function - Reverse Engineering.

Just type in the attached pole and zero expressions to excel, and put in the frequencies where you think they are, and plot out...then...

Saturday at 3:27 PM
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cupoftea replied to the thread Help in designing a Flyback with MC34063.

why not cascaded boost...surely you dont need isolation because your 12v is surely isolated? Use eg ucc28c43 and use external error...

Saturday at 3:22 PM
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cupoftea replied to the thread [SOLVED] Step Up DC-DC 12V to 400v converter.

12v to 400v is easy with a cascaded boost converter. Just use simple UCC28C43 based thing. If you want i send LTspice sim of it to you...

Saturday at 3:17 PM
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cupoftea reacted to D.A.(Tony)Stewart's post in the thread Probing and scoping MegOhm circuits? with Like.

Whenever I see a discrepancy, I always wonder, what are the differences in assumptions. I never hesitated to use 33 Meg resistors for...

Saturday at 3:13 PM

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