A circuit diagram is included but it is probably easier to use the photos as your guide as to which components go where on the PCB. Be careful not to overheat any of the components or the printed circuit board connection points as this can cause faults to occur.
eBay
1、Using high-quality materials, transparent plastic shell, double-sided epoxy circuit board, simple operation, easy welding. Frequency Response: 150Hz-20KHz. 3, keep the iron head clean: iron head surface oxidation of a layer of black impurities to form a heat insulation layer, so that the iron head to lose the role of heating.
eBay
【Design compatto】: una volta assemblato, il pianoforte elettronico misura 148,5 mm di lunghezza, 56,9 mm di larghezza e ha uno spessore di 18 mm, il che lo rende facile da maneggiare e riporre. 1 set di moduli tastiera elettronica fai da te.
eBay
Hope you could understand. PCB size: 100 100mm. Computers/Tablets & Networking.
eBay
Upgraded CW Morse code decoder with optimized circuit board and component layout for easier installation, enhanced functionality, and simpler operation. Supports audio decoding and external CW key input, enabling direct conversion of received Morse code audio into characters.
eBay
After connecting well, you can energize the device with DC 5 V. After energizing, the electronic piano will have running lights, and it can be used normally after 1 minute of powering on, touching the fruits with your hand will allow you to play the piano, and the 7 fruits correspond to the notes from left to right as follows: do, re, mi, fa, sol, la, si.
eBay
High quality PCB, has clearly marked the electronics components, even beginners can easily solder successfully. - PCB size: 2.2” 1.2” / 56.2 30mm. - Fun DIY Solder Kits ----- FM Radio. In addition, there is a 3.5 mm headset jack.
eBay
Digital tube display calculator production kit, can achieve the mathematical calculation of addition, subtraction, multiplication and division, but also can be converted to the value of the color ring resistor resistance.
eBay