# Voltage Dropped with Mysterious Reason!

#### SUNGYONGWOO

Joined Jun 19, 2020
3
I've tried to turn on small calculator (Rated Voltage : 1.5V) with charged capacitor C.

Anyway when I connected fully charged cap to load. Then voltages dropped down with mysterious reason.

In detail, I used TENG to voltage source, (TENG is a pretty similar source to PIEZO .)

To turn on rated voltage 1.5V calculator, I charged enough 2V to cap.
Next step, I connected 2V charged cap to calculator.
It doesn't work.

How can I make this situation better?

Here is the circuit diagram what I designed.

And this is voltage curve measured by voltmeter.

You can see voltage drop after connecting to load

#### Alec_t

Joined Sep 17, 2013
12,148
Welcome to AAC!
I agree with Albert. What is the capacitor value?

#### BobTPH

Joined Jun 5, 2013
3,475
You do know that the voltage on a capacitor drops when you draw current from it, right?

Bob

#### SUNGYONGWOO

Joined Jun 19, 2020
3
You do know that the voltage on a capacitor drops when you draw current from it, right?

Bob
Yes It does. Any ideas to make this situation better?

#### DarthVolta

Joined Jan 27, 2015
521
With the inductor and switch, are you trying to make a boost converter ? If the switch was a BJT or MOSFET and turned on/off rapidly, like 10,000's of times a second, in order for the current to keep flowing in the same direction in the inductor, when the switch open's it should make a voltage higher on the cap side, and lower on the diode side...and create a higher voltage that u started with. But you have a transformer/FWR, that should be over 1.5V with any size thransformer, and tank cap. ......or have 3 beers gotton to me

Last edited:

Joined Feb 20, 2016
3,882
It sounds like you are trying to get a lot more energy from your source that it is able to supply.