MEL PICBASIC Forum - LAB-XT Telephony Experimenter Board

MEL PICBASIC Forum - LAB-XT Telephony Experimenter Board - Assembled

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Recent Forum Posts

Re: Calculating base resistor on mosfet AO3400A

You can drive the MosFet directly from PIC as your frequency of activations is really slow.

Gate driver is needed if your frequency is high. Also resistors or ferrite beads are also neededin...
Ioannis - 26th July 2025, 10:57

Re: Calculating base resistor on mosfet AO3400A

Richard brings up an important point about the PIC's drive current capacity. I'll use 10mA in my calculations.

R = V / I
= 5 / 0.010
= 500

P = V * I
= 5 * 0.010
= 0.050 W (just...
Demon - 25th July 2025, 19:58

Re: New project - MSFS C++ USB interface

That's a cool service. 😎

Gonna save that one.
Demon - 24th July 2025, 19:25

Re: New project - MSFS C++ USB interface

Sometimes it is cheaper in small quantities to have someone make your parts vs building your machines to do the job. Plasma cutters do not make clean enough cuts as needed for control panels. Anyway...
mark_s - 24th July 2025, 16:40

Re: Calculating base resistor on mosfet AO3400A

no gate driver needed for occasional intermittent switch... the rise and fall times are where there is power dissipated in the mosfet...... do a calculation of the power dissipated in that 30 micro...
amgen - 24th July 2025, 15:09

Re: Calculating base resistor on mosfet AO3400A

1 columb = 1 amp for 1 second

To apply 6nC of charge in 5.5 nanoseconds takes
6e-9/5.5e-9 = 1.09 amps

It needs a gate driver to get that speed, a pic with 20mA of drive can provide a 6nC...
richard - 24th July 2025, 14:33

Re: Calculating base resistor on mosfet AO3400A

.
usually, all the gate drive circuits mostly have to do with the frequency the mosfet is engineered to operate. That is where high frequencies matter and the rise and fall times of the mosfet...
amgen - 24th July 2025, 13:16

Re: New project - MSFS C++ USB interface

One of the challenges I had given myself was to simulate an electric breaker in MSFS, just like the ones in a Cessna 152.

9983

So far, the least expensive and "good enough" technique was...
Demon - 24th July 2025, 02:45

Re: MOSFET selection

Excellent!

Yeah, that's why I considered the opto-couplers at first; to isolate the solenoid from the 5V circuit, but I'll be using separate sources:

- 5V from TPS56637 (for PICs, LEDs, and all...
Demon - 23rd July 2025, 23:55

Calculating base resistor on mosfet AO3400A

Using datasheet:
https://www.aosmd.com/res/datasheets/AO3400A.pdf

My work so far:

I added tD(ON) and tr to get total t

Google AI says:
Ig = Qg / t
Demon - 23rd July 2025, 23:42

LAB-XT Telephony Experimenter Board - Assembled

From £349.95
Buy it Now

The LAB-XT Experimenter Board is perfect for those interested in telephony and telephone projects. It is pre-assembled with the most popular telephony functions. PicBasic Pro sample programs are included

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