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Rol Mops

My Contents: All Messages; Reviews; Comments; Answers; Questions

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Rol Mops 18/10/2018

bien conçu tres pratique

Output 5V Mini bluetooth Wireless MP3 Decoder Board Audio Module USB TF Card

5,66€ 6,37€

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Comments (0)

Rol Mops 18/10/2018

bon rapport qualité prix

5Pcs DC 12V/5V MP3 Decode Board LED USB AUX FM bluetooth Radio Amplifier With Remote

45,08€ 48,89€

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Rol Mops 20/08/2018

tres bon produit

Microflash 32GB Class 10 High Speed TF Card Flash Memory Card for Xiaomi Smartphone

17,85€ 29,73€

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Rol Mops 11/08/2018

Manque la moitié des pièces, et l’emballage n'est pas percé. Appareil inutilisable très mauvais achat

DIY LM317 Adjustable DC AC Regulated Power Supply Module Dual Supply Regulator Kit Unassembled

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Comments (1)

Rol Mops Bien vu, impossible de faire fonctionner cet appareil sans cette modification, après il fonctionne bien, excellent rapport qualité prix

vmarafdeild 14/03/2018

For this price some compromises might be expected. A: The pcb is rather thin. The board-to-trace bond is not very strong, traces tend to lift off if soldering takes too long. B: Placement of fixing holes rather strange - one is located under a 2200uF capacitor! C: Finally the amplifier suffers from a fundamental PCB design fault. The rather narrow ground trace first goes from power supply capacitors through the center of the board to speaker connector, then to the input connector and last runs back along the edge to volume and tone controls. This is really bad design which causes severe positive feedback, HF oscillations and "motorboating", at least when using speakers with resistance 8ohms or less. Audio amplifiers should have a single, central ground point and components should be connected directly to this ground point using separate traces as far as possible. High current to speakers must absolutely not share traces with low voltage input signals. Fortunately, here the solution is simple: Disconnect the ground pins of speaker connectors by cutting the traces close to the connectors as shown in the pictures. Then connect an insulated wire from the +pin of C4, directly to the speaker connector ground pins. Perhaps even use two separate wires - one to each speaker ground. Unfortunately many who buy this board might not know how to correct this problem. I still consider this kit good value for money.

TDA2030A 2.0 Audio Amplifier Module Board 18W*2 Double Track DIY Kit

7,42€ 12,91€

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Comments (2)