Semiconductor three-tube radio B-type circuit board DIY technology production

Description

Semiconductor three-tube radio B-type circuit board DIY kit technology production
Description
Notice:
No batteries, no headphones
3TD-B type low-impedance earplug three-tube machine assembly kit (v1.2)
【Main Features】
1. Receiving frequency: 525~1605kHz (medium wave band);
2. Power supply voltage: 1.5V (1 AA battery);
3. Headphone impedance: 8~32Ω;
4. Circuit board size: 95mmx43mm.
【Features】
1. There are 3 transistors with sufficient circuit performance, which can promote low-impedance headphones;
2. Only use 1 AA battery (1.5V) for power supply;
3. Use the miniature potentiometer to adjust the working current of the triode, and use the jumper to test the current, which is easy to operate;
4. There is a wire break at the bottom of the board for choosing to use mono or dual-channel headphones;
5. It has a front panel and a back panel, which can play the role of part of the shell, beautiful and beautiful;
6. The headphone socket also functions as a power switch. Unplug the headphone plug to shut down.
【product description】
1. The base of the circuit board is glass fiber material, the thickness is measured about 1.5~1.6mm, the green oil is white, the pad is sprayed with tin, and it can be directly welded without grinding;
2. There may be some scratches and dust on the board base surface and copper foil surface, as well as traces of cleaning;
3. The antenna coil No. 2 and No. 3 wire ends are connected together to form a whole, which is caused by the production process, and the player can cut it by himself;
4. The circuit board obtained by the buyer may be slightly different from the sample in the picture, mainly due to the change of the component position and the same circuit structure. This product has been modified and perfected for n times from the trial production sample to the sold product (mainly modifying the wiring of the circuit board), and is still in the process of continuous improvement. Usually minor version upgrades will not be re-photographed and uploaded, hereby declare.
package ：
1pcx
Semiconductor three-tube radio B-type circuit board DIY kit technology production
If you have any questions, please contact us in time, we will help you deal with the problem for the first time.
Shipping
Item will be shipped within 24 -48 hours after full payment is received.
Normally the shippment to worldwide is used to take 15 to 30 business days, exclude Sat & Sun.
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We greatly appreciate your POSITIVE feedback. Please do NOT leave negative or neutral feedback without any contact.