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The SLA battery is charged from the vehicle's battery. When the engine is running, the voltage remains fairly constant, which greatly simplifies the charging circuit. If the SLA battery is fully charged, any further charging current from the vehicle...
The circuit described is a discharge delay circuit that offers a longer delay compared to a standard rechargeable delay circuit, while also maintaining relatively high accuracy. The schematic diagram illustrates the input and output waveforms. Typically, when there is...
The piezo diaphragm can originate from a music card, and if two or three diaphragms are available, they can be connected in parallel, as illustrated in the diagram, to observe their impact on the output frequency. The only component...
The filter consisting of resistors R1, R2, and capacitor C1 integrates the PWM waveform. The purpose of the operational amplifier appears to be that of a non-inverting amplifier, with the gain determined by resistors R6 and R7. However, the...
This is a very simple circuit utilizing a 555 timer IC to generate a square wave of frequency that can be adjusted by a potentiometer. With values given, the frequency can be adjusted from a few Hz to several...
This is a police tone circuit for a siren. It is simple and easy to construct. VR1 and VR2 are used to adjust the delay of the siren sound. The design is straightforward and uncomplicated. The police tone siren circuit...
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