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by RGJ-PI
Wed Nov 24, 2021 5:01 pm
Forum: General discussion
Topic: Will you make microchips like RP2040, but with leads (QFP)?
Replies: 19
Views: 644

Re: Will you make microchips like RP2040, but with leads (QFP)?

As mentioned earlier a leaded version is of course possible but the costs and size of the device would be prohibitive. Companies using the chip in products just wouldn't buy it over the small existing package. What you could do though is get a PCB made that mounts the RP2040 and takes the signals ou...
by RGJ-PI
Wed Nov 24, 2021 4:43 pm
Forum: General discussion
Topic: Identify missing resistors?
Replies: 5
Views: 168

Re: Identify missing resistors?

Regarding your second image, a resistor should be fitted in that position. It sets a VBUS current limit for the on board USB sockets. Fit a 20K 0402 resistor.
by RGJ-PI
Fri Nov 19, 2021 12:14 pm
Forum: Graphics, sound and multimedia
Topic: Sound quality inquiry.
Replies: 1
Views: 118

Re: Sound quality inquiry.

Not 100% sure what you are wanting to do here but is it connect the co-ax digital SPDIF output of your CD player to a Optical TOSLINK input on your TV? Seems odd as most TV's I know only have Optical out but yours might be different.. However if this is what you are looking to do and your TV has opt...
by RGJ-PI
Thu Nov 18, 2021 4:20 pm
Forum: Troubleshooting
Topic: pi4b cannot start normally
Replies: 1
Views: 87

Re: pi4b cannot start normally

The cracked CSP is a power switch/driver. Part number FPF1320UCX

https://www.digikey.co.uk/en/products/d ... CX/3163289
by RGJ-PI
Tue Nov 16, 2021 3:16 pm
Forum: Troubleshooting
Topic: RP4B 8GB Suddenly stopped working, Power LED Red, ACT LED Green
Replies: 5
Views: 146

Re: RP4B 8GB Suddenly stopped working, Power LED Red, ACT LED Green

From your measured Voltages it looks as though the 5V rail was shorted to the 3V3 rail. This has damaged the main power management IC and possibly others. Unfortunately your Pi 4 is now dead.
by RGJ-PI
Fri Oct 29, 2021 2:46 pm
Forum: Graphics, sound and multimedia
Topic: Iqaudio headphone header question
Replies: 8
Views: 269

Re: Iqaudio headphone header question

Pin 5 pulled high with a 100k resistor by the looks of it. Inserting a headphone plug shorts pin 5 to ground (by a switch contact onside the socket) so externally shorting pins 4 and 5 will achieve the same thing.
by RGJ-PI
Fri Oct 29, 2021 1:20 pm
Forum: Graphics, sound and multimedia
Topic: Iqaudio headphone header question
Replies: 8
Views: 269

Re: Iqaudio headphone header question

I'm not in the office and haven't got access to that board's documents here but I do have a similar IQ DAC board here at home. It looks as though plugging in a headphone shorts pin 5 of the header P6 to ground. You could try doing that. Full pinout of P6 below for your info.. Pin 1. Left Headphone o...
by RGJ-PI
Tue Sep 14, 2021 9:22 am
Forum: Beginners
Topic: Multiple screens with Raspberry Pi
Replies: 3
Views: 281

Re: Multiple screens with Raspberry Pi

If you want two (or more) screens showing the same image then you can use an active HDMI splitter to feed the multiple screens.

If you want two independent screens as in a twin monitor setup then a Pi 4 or Pi 400 is ideal.
by RGJ-PI
Thu Sep 02, 2021 9:03 am
Forum: Beginners
Topic: Mosfet IRF520
Replies: 6
Views: 338

Re: Mosfet IRF520

But as pcmanbob says it should normally work anyway unless you are really unlucky with your IRF batch. Are you 100% sure you have the MOSFET circuit ground referenced to the PI ground?
by RGJ-PI
Thu Sep 02, 2021 8:58 am
Forum: Beginners
Topic: Mosfet IRF520
Replies: 6
Views: 338

Re: Mosfet IRF520

If you want to use your PC817 optocoupler instead then you can connect it as follows.. GPIO pin via say a 470R resistor to Opto Pin 1 Pi ground to Opto Pin 2 LED PSU + Voltage to Opto Pin 4 IFR520 gate to Opto Pin 3 and a 10K resistor from the gate to LED PSU ground. Has the advantage of keeping the...
by RGJ-PI
Thu Sep 02, 2021 8:52 am
Forum: Beginners
Topic: Mosfet IRF520
Replies: 6
Views: 338

Re: Mosfet IRF520

You could use an additional N MOSFET to do the gate switching. Basically use a 10K resistor from the LED supply to the IRF520 Gate. This will hold the LED MOSFET on all the time. Then use a small MOSFET (BS123 or whatever) and use the Pi GPIO to switch this MOSFET. Connect between ground and the IRF...
by RGJ-PI
Thu Aug 26, 2021 4:12 pm
Forum: Troubleshooting
Topic: Pi auto boot after power outage?
Replies: 11
Views: 578

Re: Pi auto boot after power outage?

moved to Pi Troubleshooting forum as doesn't appear to be a Pico
by RGJ-PI
Wed Jul 28, 2021 10:15 am
Forum: Advanced users
Topic: How to measure power consumption on Rasp 3B+ or 4B
Replies: 5
Views: 614

Re: How to measure power consumption on Rasp 3B+ or 4B

I've used a Texas Instruments INA260 IC for this purpose before. https://uk.farnell.com/texas-instruments/ina260aipwr/current-power-voltage-monitor/dp/3005368 Solder it onto a SMT to DIP adapter and wire it to the PI's I2C bus to take measurements via Python as you require. I'd recommend powering th...
by RGJ-PI
Tue Jul 27, 2021 2:20 pm
Forum: Troubleshooting
Topic: Pi 4 not powering on
Replies: 2
Views: 147

Re: Pi 4 not powering on

A dim green led can mean a damaged 3V3 Voltage rail. If you have access to a multi-meter you could check the 3V3 Voltage on Pin 1 of the GPIO headers.
by RGJ-PI
Thu Jun 24, 2021 4:13 pm
Forum: Beginners
Topic: Help please.12V relay nor being triggered
Replies: 15
Views: 615

Re: Help please.12V relay nor being triggered

Yes you need to put 12V onto the relay module. Ground and GPIO only to Pi.
by RGJ-PI
Thu Mar 25, 2021 9:05 am
Forum: General
Topic: Raspberry pi Pico voltmeter for 0~12V measure
Replies: 6
Views: 688

Re: Raspberry pi Pico voltmeter for 0~12V measure

Yes that'll work fine if connected to a HDD PSU though the resistors are a bit lower values than I'd have chosen. You can measure up to 13.2V (at 3.3V into ADC) so gives some top end measurement headroom.
by RGJ-PI
Wed Mar 24, 2021 4:30 pm
Forum: General
Topic: Raspberry pi Pico voltmeter for 0~12V measure
Replies: 6
Views: 688

Re: Raspberry pi Pico voltmeter for 0~12V measure

You just need a simple potential divider. You don't mention what the 12V is from though? If output of a PSU then lowish resistors will be fine. If using it to measure a signal then you'll want to keep the resistors high so they don't load the signal. You could start with a top resistor (to measureme...
by RGJ-PI
Fri Mar 19, 2021 8:52 am
Forum: Troubleshooting
Topic: RPi 4B (2018) smoke from near USB-C
Replies: 10
Views: 603

Re: RPi 4B (2018) smoke from near USB-C

That part is a 4.7uH 2A surface mount inductor. If it has been so hot as to emit smoke there's a good chance the 3V3 rail of the PMIC is now dead. Is the inductor now open circuit and if not is there still 3V3 on pin 1 of the GPIO header?
by RGJ-PI
Tue Mar 09, 2021 11:10 am
Forum: Off topic discussion
Topic: You are not authorised to read this forum.[solved]
Replies: 9
Views: 847

Re: You are not authorised to read this forum.

Looks like another Mod has moved it to a non public area due to it being a duplicate.
by RGJ-PI
Wed Mar 03, 2021 9:18 am
Forum: Beginners
Topic: Connecting IR LEDs to Raspberry pi 4B
Replies: 5
Views: 273

Re: Connecting IR LEDs to Raspberry pi 4B

This comes up quite often on here. Your circuit looks okay but I'd recommend swapping out the NPN transistor for a low Rds MOSFET. The commonly used BS170 should be okay here.
Are you getting no IR at all with your circuit? Can you check with a multi-meter that GPIO 21 is actually going high?
by RGJ-PI
Fri Feb 12, 2021 2:48 pm
Forum: General discussion
Topic: extremely poor production quality control
Replies: 25
Views: 1589

Re: extremely poor production quality control

One of my roles here at Pi is infract to investigate returned items from suppliers. I've not seen a board returned with this issue as yet. Now yes, that's not to say there aren't others out in the field or maybe you have the first and only one. A lot of Pi's get bought by industrial users and are ty...
by RGJ-PI
Thu Feb 11, 2021 3:12 pm
Forum: Graphics, sound and multimedia
Topic: Hum through external RCA sockets connected to P1 on IQAudiO DAC+
Replies: 4
Views: 429

Re: Hum through external RCA sockets connected to P1 on IQAudiO DAC+

Andy, your interpretation of the pinout looks wrong and have the ground and signal swapped. Admittedly the silk screen text is a bit ambiguous. Wire up your interconnects as per LTolledo's post above and you should be good to go.
by RGJ-PI
Tue Jan 12, 2021 4:50 pm
Forum: Wanted
Topic: Looking for SW dev with experience in software defined radio experiance
Replies: 4
Views: 1043

Re: Looking for SW dev with experience in software defined radio experiance

I previously worked at a company who design software defined radio wireless analysers for clients. I'll pass on your website and requirement details to them in case it is of interest to them.

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