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Using the Voice Recording and Playback Chip APR9600 to Make a Countdown Trigger [Copy link]

When using a certain military instrument, two people are required to operate it. One of them commands according to the 10s or 20s preparation time requirement and refers to the countdown subtraction of the stopwatch, and the other person operates the instrument in time according to the command. In this case, if a countdown voice automatic trigger made of the APR9600 voice circuit with accurate timing and convenient recording and playback is used, the instrument can be operated by one person, and it is convenient to coordinate with other personnel, which significantly improves efficiency. 

The countdown trigger circuit is shown in the attached figure. The whole circuit mainly consists of three parts: voice recording and playback circuit, audio amplifier circuit and trigger control circuit. The circuit principles are described as follows.
Voice recording and playback circuit

Used to pre-record and replay countdown language, and output working status signal. The voice recording and playback circuit is mainly composed of single-chip 60s analog voice recording and playback chip APR9600 and other devices. Set /MSEL1 to "0" and /MSEL2 to "1" to use the chip in two sections and control in parallel. The maximum recording and playback time of each section is 30s. S1-1 is the recording and playback switch, closed for recording, open for playback. Close S1-1 and press M1, and use the local microphone to record the 20s countdown language "Countdown starts, 20, 19, ... 3, 2, 1, play" by referring to the stopwatch. Press M2 to record the 10s countdown language in the same way, and then open S1-1 to make the chip play.

Audio amplifier circuit

It is composed of low-power audio amplifier integrated circuit LM386, etc., which is used to further amplify the voice signal sent by IC1 and increase the volume. When playing, the language signal is output from SP+, adjusted by W1, and added to IC2 for amplification and output.

Trigger control circuit

It is mainly composed of components such as V1~V4, which are used to output control signals and trigger the instrument every time the playback is completed. The ⑩ pin of IC1 is the busy signal indication output terminal. When playing, it outputs a low level and L1 lights up. When stationary, it outputs a high level and L1 turns off. In the stationary state, the high level of IC1⑩ pin turns on V2 through R14, and at the same time, V1 is cut off due to no bias current, V3 and V4 are also cut off, and the relay does not work at J1. In the playback state, IC1⑩ pin outputs a low level, V2 is cut off, V1 is turned on due to bias current and charges C7, and the voltage on C7 completes the circuit through R15, the e pole and b pole of V3 and R16 at the same time, generating a voltage drop of about 2.5V on R16. Since this voltage is less than the conduction voltage of the light-emitting diode D1 and V4, V4 is still cut off. After the sound is played, the IC1⑩ pin returns to the high level state, V1 is cut off, V2 is turned on, and the discharge current of C7 is still maintained for a few seconds when V3 is turned on. The power supply completes the circuit through V2, V3, and R16. At this time, the voltage across R16 reaches about 3.5V, D1 is turned on, V4 is also turned on, J1 is energized, and the J1-1 contact is closed to complete the triggering action.  

D2 uses a light-emitting diode with a turn-on voltage of 2V, and J1 uses a H2-5HG-K type relay with a working voltage of 5V. There are no special requirements for other components.  

When using, first pre-record the countdown voice according to the above method, connect the J1-1 contact to the two ends of the original trigger switch of the instrument, and press M1 or M2 as needed to complete the automatic triggering action.

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