Customer:
I purchased two MCP4725 digital-to-analog converters and neither of them works properly. I’m using Arduino with the Adafruit_MCP4725 library. I’ve tried everything but the issue is in the electronics. When connected to 3.3V and 5V, the maximum output voltage is 3.3V, which is not high enough for my needs. I’ve also tried a different library and a different Arduino board but the result is the same.
Original message (Croatian)
Kupia san dva MCP4725 digitalno analogna konvertera i ne radi mi ni jedan. Koristin Arduino i Adafruit_MCP4725 library. Pokuša san sve al problem je u elektronici. Kad je spojen na 3.3V i na 5V maksimalan izlazni napon mu je 3.3V što u mome slučaju nije dovoljno visok napon. Koristia san i drugi library i drugi Arduino al je rezultat isti.
Originally submitted via email support on 21 June 2022. Migrated to the forum for community visibility.
Soldered Support:
The MCP4725 module operates at 3.3V when powered via the easyC connector. When powered via pins at 5V, a voltage regulator steps that 5V down to 3.3V. Therefore, the module will always output 3.3V, which is its maximum output voltage. If this does not meet your requirements, you can desolder the regulator and connect the 3.3V power rail to 5V so the module operates at 5V with a 5V output voltage. If you lack soldering capability or prefer not to do this, you can contact us to return the modules. From what I understand, your issue is the low output voltage. If you have another problem (the module not working at all), contact us and we will help resolve it.
Original message (Croatian)
Isprike zbog kašnjenja s odgovorom. Zbog GO tehnička služba nije mogla odgovoriti na vaš upit.
MCP4725 modul radi na 3V3 ako se napaja preko easyC konektora, a kada se napaja preko pinova (5V) onda se koristi regulator napona koji tih 5V spusti na 3V3. Zbog toga će modul uvijek davati 3V3 na izlazu odnosno to mu je maksimalni izlazni napon. Ako Vam to ne odgovara mogli bi ste odlemiti regulator i spojiti 3V3 naponski vod s 5V kako bi vam modul radio na 5V i njegov izlazni napon bio 5V. Ako nemate mogućnost lemljenja ili ne želite to raditi možete nas kontaktirati i vratiti module. Koliko sam shvatio ovo je Vaš problem da je izlazni napon nizak. Ako imate još neki problem (da modul ne radi uopće) kontaktirajte nas te vam pomognemo u rješavanju problema.
Customer:
This information should be emphasized in the product description. I have no choice but to desolder the regulator, but you could help me by explaining exactly what needs to be done so I don’t damage the module.
Original message (Croatian)
Takve informacije bi trebale biti naglašene u opisu proizvoda. Nemam izbora nego sam odlemljivat regulator ali to biste mi mogli olakšat objašnjenjem što treba točno napravit da ne uništim modul.
Soldered Support:
To modify the breakout to output 5V, you need to desolder the voltage regulator (marked in red in the attached image) and connect 3.3V to 5V as indicated by the green line. After making this modification, do not connect the board via the easyC connector at 3.3V voltage levels. Instead, use the header designed for 5V voltage levels.
Original message (Croatian)
Kako bi prepravili breakout da na izlazu daje 5V trebate skinuti regulator napona (na slici u prilogu označen crvenim) i spojiti 3V3 na 5V što je označeno sa zelenom linijom. Kada napravite navedenu prepravku nemojte spajati pločicu putem easyC konektora na 3V3 naponske razine nego koristite header koji je namijenjen za 5V naponske razine.
Attachment omitted in migration: DAC.png