6
votes
Accepted
Is the 7809 bad for a DC motor?
You left out the capacitors that the LM7809 datasheet specifies.
Three 18650 cells in series is anywhere from 7.5V (fully discharged) to 12.6V (fully charged.) The normal operating voltage is 3.7V ...
- 72.5k
5
votes
Identify component marked R3377 in a ZVR1 [Playstation VR MB]
Looking at the The ultimate SMD marking codes database for marking codes starting with R3 finds the candidate device:
Marking
Name
Manufacturer/Case
Function
R33
...
- 5,293
4
votes
Is the 7809 bad for a DC motor?
Several issues here, some of which can be solved by reading the datasheet of the exact type of 7809 you're using.
The text of the datasheet will also say that those capacitors should be as close as ...
- 3,539
4
votes
Accepted
Identify component marked R3377 in a ZVR1 [Playstation VR MB]
Possibly OnSemi NCP585DSN33T1G - a 3.3 V LDO rated for up to 350 mA output.
Based on the datasheet linked above the part is marked with a five digit code where the first three digits are the part ...
- 67.8k
3
votes
Is the 7809 bad for a DC motor?
The 7809 itself is fine for a DC motor, but with caveats.
Input and output capacitors are needed for the 7809, but for your application, their absence would not make a difference significant enough to ...
- 2,459
3
votes
Accepted
Identify SMD voltage regulator with top marking: BDCM
The markings match with an ETA Solutions ETA6020S2G-T which is a load switch and not a regulator.
The markings with the underscore under the last character also points towards ETA Solutions. See the ...
- 5,947
2
votes
Identification for L313 marking, 5 pins
I think its a TI TLV2731 as it matches the pin connections and part marking.
- 129
2
votes
Help identify this SOT-23 5 pin component labeled ADU06 and weird behavior
From the image, we can see that it is connected to Pin 12 of the MCU. In the image from the datasheet we can see that this is a reset pin.
So this component is probably a voltage supervisor that has ...
- 3,539
2
votes
IRF540 MOSFET Replacement
This is dangerously close to a shopping question, but in any case there are some MOSFETs specifically targeting linear operation, so I suggest looking for those.
Anecdotally, the SOA numbers for ...
- 407k
2
votes
Accepted
Boost Converter Output Isn't Desired Value
For 5 volt in, 12 volt out the duty cycle is 1 - Vin/Vout or 58%. Since your output power is 200 ma @ 12 volts, (2.4 W) the average input current must be at least 480 mA. Since you are only on 58% ...
- 11.6k
1
vote
How to correctly indicate reponse time of a power supply
Well, no idea, you don't describe your system at all -- but there are a few typical cases, and one might argue anything else is pathological and would indicate bad design of the system, anyway.
...
- 39.7k
1
vote
Accepted
How to correctly indicate reponse time of a power supply
Does the voltage drop happen exactly at the time that the current draw
is being increased?
Yes, but capacitance and inductance can make slight delays from the source to the load. In most power ...
- 84.8k
1
vote
Accepted
Distribute power from one battery to multiple devices
All these components on that system, works in certain amount (range) of voltage, right?
Right.
how can I create a system - above the main system - to distribute power correctly
Do not power the ...
- 22.8k
1
vote
Accepted
How to Properly Select Resistors and Capacitors for a Voltage Reference Circuit with BJTs
To build a voltage reference that depends on BJTs without feedback, diodes and potentiometers is not a good idea. This will not offer good voltage stability.
You can select R6 and R7 based on the BJT ...
- 7,653
Only top scored, non community-wiki answers of a minimum length are eligible