Activity for Stefanâ€
| Type | On... | Excerpt | Status | Date |
|---|---|---|---|---|
| Comment | Post #286964 |
Thank you for your reply, I chose nrf24 because it is a one time project and there is a lot of material for it online, since it is often used in Arduino projects. It was also in stock in large quantities in multiple vendors and as you mentioned getting anything delivered is quite a nightmare right no... (more) |
— | over 2 years ago |
| Comment | Post #286946 |
Thank you for your answer (more) |
— | over 2 years ago |
| Comment | Post #286945 |
Thank you for your answer. I'm aware of the design example. I didn't formulate the question clearly. My main question is basically: How do I know, if the PA is necessary? Is there a way to calculate approximate range of nrf24 chip together with an SMA antenna? (more) |
— | over 2 years ago |
| Edit | Post #286944 |
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— | over 2 years ago |
| Edit | Post #286944 |
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— | over 2 years ago |
| Edit | Post #286944 | Initial revision | — | over 2 years ago |
| Question | — |
Power amplifier for remote controller I'm designing remote controller based on NRF24L01 and STM32. I want to use SMA antenna. My question is regarding power amplifier (PA). When is it necessary to use one? The range I'm aiming for is 20+ meters. Every commercially available module with NRF24 and SMA antenna has PA, but I would like to sa... (more) |
— | over 2 years ago |
| Comment | Post #286823 |
I will try my luck one last time, and ask: In your answer you suggested using "low-power comparator to deactivate the added MOSFET". Did you mean something like TLV6713 or LM311? (more) |
— | over 2 years ago |
| Edit | Post #286807 |
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— | over 2 years ago |
| Comment | Post #286823 |
Hi, i just noticed that the battery cells and load were switched on the schematics... I edited the post. (more) |
— | over 2 years ago |
| Edit | Post #286823 |
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— | over 2 years ago |
| Comment | Post #286823 |
The voltage divider makes sure that the voltage will remain at 6.2 V on the Vcc pin of the supervisor when the batteries are fully charged. As for the discharging of the battery trough the diode, do you mean the lower Q3 MOSFET? It will be switched on even after the voltage drops under 6 V. Yes there... (more) |
— | over 2 years ago |
| Edit | Post #286823 | Initial revision | — | over 2 years ago |
| Answer | — |
A: Battery protection circuit This is the circuit I have decided to use: Schematics The cut-off voltage will be just above 6 V. MOSFETs used are SiRA14BDP and the voltage supervisor is TS831. Maximum current consumption of TS831 is just 12 uA. For the voltage on one cell to hit dangerous level it needs to drop from 3 V t... (more) |
— | over 2 years ago |
| Comment | Post #286809 |
Is that because of its input current of 20 mA? Yes i can see now that is too high. I have found, hopefully, a better one. I am not sure how one can calculate the comparators power draw once the voltage threshold has been crossed. Can Quiescent Supply Current be used for this? (more) |
— | over 2 years ago |
| Edit | Post #286807 |
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— | over 2 years ago |
| Comment | Post #286809 |
Thank you for your answer. I edited the question adding the new circuit schematics. Would this one work? (more) |
— | over 2 years ago |
| Edit | Post #286807 |
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— | over 2 years ago |
| Edit | Post #286807 |
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— | over 2 years ago |
| Edit | Post #286807 |
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— | over 2 years ago |
| Edit | Post #286807 | Initial revision | — | over 2 years ago |
| Question | — |
Battery protection circuit I am using two 18650 cells in series to power a RC car. Is the voltage goes below 6.2 V, the battery should be disconnected to prevent over discharging the battery. At the same time I want to implement reverse battery protection into the circuit. Since n-channel MOSFETs will be used for the H-bridg... (more) |
— | over 2 years ago |
| Edit | Post #286660 | Initial revision | — | over 2 years ago |
| Question | — |
Limiting current to DC brushed motor This question is related to my previous question. I want to drive a brushed DC motor using H-bridge. To power the motor two 18650 cells will be used in series. The issue is that I want to limit the current to 10 A (to prolong the battery life span, lower power dissipation on MOSFETs, etc). Is th... (more) |
— | over 2 years ago |
| Edit | Post #286654 | Initial revision | — | over 2 years ago |
| Question | — |
H-Bridge components and calculations My goal is to make an RC car, and I have a couple of questions regarding driving the brushed DC motor. Schematic for half of my H-bridge looks like this for now (it will be identical on the other side): Half of H-Bridge I am trying to make a H-Bridge circuit to drive a brushed DC motor (MotorData... (more) |
— | over 2 years ago |