Traditional Chinese Electronic cradle machine: Circuit Design, Parts List & Workshop Prototype Guide
In short: Traditional Chinese Electronic cradle machine. This entry documents a circuit & prototype taken from Chinese practical-technology literature, written for small-scale makers and home producers. The text below is the full English translation of the original Chinese workshop notes, covering materials and quantities, the step-by-step sequence, and the practical cautions recorded in the source. Roughly 2509 words of English technical text, translated and preserved without editing. It is intended for experimental and reference use, not for regulated or commercial certification.
Electronic cradle machineFigure 200-1 is the electrical schematic diagram of the electronic cradle machine. It consists of multivibrators (VT2, VT3, both using 3DG6 tubes), switching amplifiers [VT4 (3DG12), VT5 ( 3DD15)], electromagnet power supply [VD4~VD7 (2CP21)] and regulated power supply [VD1 (2CP10), VT1 (3DG12), VD2], etc.Circuit working principle:The multivibrator outputs a rectangular wave of a certain frequency, and the switching amplifier amplifies this pulse signal to control the action of the electromagnet. Adjusting the resistance of RP1 and RP2 can change the time of attraction and release of the electromagnet. When the oscillator period is equal to the natural oscillation frequency of the cradle (that is, the frequency at which the cradle is allowed to rock left and right after being pushed once) and resonance occurs, a small amount of supplementary energy can be provided each time to maintain the swing of the cradle.Figure 200-1Production of non-standard components:(1) Electromagnet: Use enameled wire of about Φ0.7mm to be tightly wound on the skeleton as shown in Figure 200-2 with 2000 to 2500 turns. At this time, the DC resistance of the coil should be about 12Ω and should not be less than 10Ω. The axis of the winding frame is lined with a layer of copper (copper tubes are better) for smoothness and wear resistance, and a piece of ordinary tissue paper can be used as insulation between layers.Figure 200-2Use a section of Φ12mm ordinary carbon steel as a movable angle core, file out a flat piece at each end, and drill a small hole in it to connect the cradle (see Figure 200-3).(2) Power transformer: …
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Lei Cheng
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Lei Cheng