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That's close to what I already selected to protect the main power input from surges: ERZV10D220
I need the 10mm size rather than 20mm size to fit inside the car phone transceiver case. The "180" part you linked has a "maximum allowable" DC voltage of 14V, which is too close for comfort on an...
Two concerns with that approach:
Everything I read recommends placing the flyback diode as close to the and directly across the inductive load as possible. If the diode was in the car phone, then would that expose other circuits/components in the vehicle to some kind of side effects? In my car...
I'm trying to nail down the hardware design for the external horn alert feature, and I think I may be able to improve the robustness of mine compared to the original car phone.
For reference, here's the wiring diagram from the car phone owner's manual:
The car phone acts as a low-side switch...
I did some testing of temperature thresholds with real thermistors (instead of simulating them with potentiometers)
It wasn't the most accurate testing. I was using an IR thermometer to monitor the temperature of the battery while warming it up with a hair dryer to test high temp thresholds...
My updated battery/power management circuit is working! I did a lot of testing with a power supply and electric load, and have moved on to testing it with my car phone Bluetooth adapter.
The larger MOSFETs seemed to solve all my problems. I was able to draw over 2 amps for an extended period...
Here's a demo of how the original car phone can beep the car's horn to alert you to an incoming call when you are away from your car.
Could you imagine sitting in a restaurant eating lunch while listening for your car horn, then running out to answer an important call?
I'm considering...
That's really the key here. I do not have the resources or ability/knowledge to do full/proper testing/analysis, potentially destroying multiple iterations of prototypes, to meet any particular standards for ESD protection, etc. I'm just an amateur trying to do whatever is reasonable to give my...
I'm hoping for some guidance here...
While waiting for my next batch of prototype boards, I'm thinking about what I should do to make my main motherboard PCB more robust before I consider selling my car phone conversion to anyone else. My prototype has survived just fine in my car all last...
I created a 3D model for the special obsolete connector (JAE DRA-8SC-F0) on my car phone's PCB that is originally used to connect the portable battery circuitry, but I am reusing in my Bluetooth conversion to connect to the Bluetooth module.
The 3D render of my PCB is finally pretty...
Here's my second attempt at creating a 3D model of a part: the RJ45 port that the handset plugs into. It's much better than the basic cube that came as the model for this part from SymacSys.
Here's the real part:
It's slightly different from the RJ45 port on the original car phone...
And here's a sneak peak at what my board will look like with the programming port added on, and the battery holders relocated. I still need to fine-tune the positioning of the pin headers for the programming port a bit more.
I really need a better 3D model for the RJ45 port and the special...
Today I started learning how to create 3D models, using "onshape" (free web-based 3D CAD design software). I made this model of the antenna connector on my car phone so I can better visualize my PCB layout and ensure I don't place any components or traces too close to it.
In my custom Bluetooth...
I updated my battery module design to use the UMW 50N06 MOSFET. Conveniently, this is a part that is in stock at JLCPCB. Unfortunately, I still need to pre-order a couple more of the battery charging ICs before I can place an order for the updated boards, so it will probably be about 3 weeks...
Now for a bit of a side quest. Once I have the new battery/power management circuitry worked out, I plan to position the 3 batteries and all the battery charging/protection circuitry in the area currently occupied by the red battery management circuit board in my current prototype:
This will...
Thanks for the tip. Fortunately, this is one detail I double/triple/quadruple checked because I am aware that there are a variety of pin arrangements for MOSFETS. I was careful to select the correct symbol in KiCad that matched the pin order of the MOSFET I had selected, and double-checked the...
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