Codebeat
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2 answers
6 votes
881 views
Fake a panasonic battery to revive camera to copy photos from internal memory
Accepted answer
5 votes

Allright, finally we done it! @KalleMP had the eye opener, however this was a slightly different battery (DMW-BLG10E instead of the DMW-BCG10E and it is fore sure another "valid and safe battery ...

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1 answers
0 votes
843 views
Where can I find a datasheet/info of/on this "music speakers" 35 segment LED display with 7 legs?
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3 votes

Sorry for the late reply but there isn't any answer posted. Yup, it is charlieplexed for sure because I figure it out by placing one display unit on a breadboard and test all individual pins one by ...

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3 answers
4 votes
7k views
Reverse polarity protection idea
2 votes

See also afrotechmods channel video for an explanation. Quick explanation/characteristics: Less power loss/dissipation in comparison to a diode; Voltage drop of about 1V at the output. Keep in mind ...

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2 answers
0 votes
88 views
Isolated Power Supply Modules
2 votes

Take a look at the MORNSUN isolated DC/DC converters, have used many and works great. Take a look at their product page for example: https://www.mornsun-power.com/html/products/4/dc-dc-converter.html ...

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4 answers
2 votes
2k views
Digitally controlled audio fader circuit?
2 votes

Updated answer 01/23/2017: Maybe this is an answer: Digital Optical Volume Control with LED and photoresistor (light to seperate circuits, optical pot) Using light to control the 'fades'/volume of ...

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1 answers
1 votes
84 views
-30V power supply for HTS6520
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1 votes

Okay, got it. It was pretty simple. Swap the main PSU with another more powerful one, 3A 12V (maybe other was not powerful enough for some reason). Made a mistake in the pinout schematic, there is no +...

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1 answers
0 votes
321 views
WAVGAT Pro Mini, no serial output
Accepted answer
1 votes

Okay, that was pretty fast. Something wrong with the board definitions/library? dunno. There are several implementations of the board definitions/library available and some are old or incomplete (?)....

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1 answers
1 votes
86 views
Arduino based digital to AC conversion schematic
1 votes

It will help to explain what you want to drive with it because maybe it is not required the way you want it, maybe you don't need it. The 555-timer is also vague because you are using a MCU that can ...

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2 answers
0 votes
585 views
How to verify a VHDL I2C master?
1 votes

I think you searching for this (old question of mine): Is there a general I2C command to see if a device is still present on the bus? The solution at this answer shows you how to check the device ...

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2 answers
1 votes
306 views
Component identification 8Y
1 votes

It's a audio transformer/isolator, compare this picture: Link to the component: https://nl.aliexpress.com/item/5PCS-1-1869FH-60UH-1-1-SMD-digital-audio-isolation-transformers/32432427615.html No ...

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3 answers
1 votes
3k views
Digital Optical Volume Control with LED and photoresistor (light to seperate circuits, optical pot)
Accepted answer
1 votes

After some months: Thanks go to EM Fields, which points me into the right direction. Vactrols are not cheap components and only available at some stores. So I decide to build my own vectrols and this ...

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4 answers
2 votes
9k views
Can 2 boost converters outputs be put in parallel at the same voltage?
1 votes

Made and test this yesterday with two of these very excellent boards: https://nl.aliexpress.com/item/wholesale-2-pcs-lot-DC-DC-2A-Adjustable-Step-Up-Boost-Power-Supply-Converter-Module-2/32266587114....

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3 answers
25 votes
45k views
Is it possible to use just a capacitor to debounce a button?
0 votes

"so I don't want to do a full-blown debounce circuit which would complicate the design". I really don't understand why you made it that complicated or think that complicated. You don't ...

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5 answers
3 votes
4k views
Need a LED Display
0 votes

Old question, I know, however think this might be a good and easy start. Take a look at the KEY&LED modules, very nice, integrates buttons, simple to use and only requires 3 wires. Can also used ...

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3 answers
2 votes
1k views
Replace/refresh 7 segment display of vintage 80's clock radio
0 votes

This is not a real solution however it is some better now by shorting the pins of the ABC-LDR (Auto Brightness Control) at the front. Especially at night (dark room) it is an improvement. Don't want ...

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3 answers
2 votes
4k views
SMBus with AVR?
0 votes

Now (2019), take a look at PackProbe: https://powercartel.com/projects/PackProbe/ A lot of info there and a nice Arduino util (available on GitHub). @DaveTweed: This is not a goody or service, read ...

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3 answers
0 votes
3k views
Trying to remove distortion of speakers seems impossible
0 votes

That isn't distortion, that is noise caused by a ground-loop. Like others mentioned, a 9V is not capable to deliver a huge amount of current. Use an USB powerbank or such to provide power. Besides 9V ...

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3 answers
1 votes
703 views
SSD1306 I2C: Draw only changes works however on wrong position, how to set position (command)?
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0 votes

Finally got it, this site/article gave me some insights to do it right: https://www.ccsinfo.com/forum/viewtopic.php?t=54453 It is at the gotoxy feature. I think the calculation at this function is not ...

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4 answers
2 votes
10k views
Ground Loop? Noise from 12v to 5v converter manifest in bluetooth audio source
0 votes

This is definitely a ground loop caused by the bluetooth module. In this video (see link below) on YouTube, a guy shows you the solution. You need an isolated DC/DC converter between the powersource ...

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3 answers
1 votes
11k views
Supply power to USB with external power supply
0 votes

The ground need to be shared between both power supplies (USB and external). Have done a several experiments with an USB soundcard. I want to seperate/isolate it (with an isolated DC/DC converter) ...

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