Radio Receiver 6 Transistor Schematic+Enclosure Speaker DIY Kit no battery The kit component selection and design principles have been identified professional radio . Requires a certain amount of knowledge to manually install electronic components. Dimensions: 125 x 68 x 28mm Operating voltage: 3V (2pcs AA batteries, not contain) Frequency Coverage: 535-1605KHz The assembly instructions: The spare parts for this teaching are 3V low-voltage all-silicon six-tube superheterodyne radio, which has the advantages of convenient installation, stable operation, loud sound, and low power consumption. It consists of an input loop high-level mixing stage , a first-stage amplifier, a second-stage amplifier, a front low-level amplifier, a detector stage, a low-level amplifier stage, and an amplifier stage. The receiving frequency range is from 535 kHz to 1605 kHz. Medium band . The design of this circuit and the selection of component parameters have been identified and approved by professional radio engineers. In addition to further learning of electronic technology in the process of assembly of components, it is also possible to grasp the electronic installation process, to know the measurement and debugging technology, and to results in the process. Note: Please check as much as possible to make sure the item is what you need.understanding. Color: As Shown Material: plastic Package Contents: 1 x Radio production kit Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.