18 Years manufacturer FTY to Lithuania Manufacturers
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|Surge protective device|
|Model:||Max continuous operationl voltage Uc-(V):||Nominal discharge current In(8/20s)(KA):||Max. discharge current Imax(8/20μs)(KA):||Level of protection Up(KV):||Protection category:|
Feedback in Generators. Circuit Engineering. In creating control and measurement devices we often use generators with capacitive, inductive, optical and acoustic feedback. The simple basic circuits can help us understand the operation principle of some generators and their structure. Generators with optical feedback. The device starts to generate oscillations between light emitter HL1 and photoreceiver VD1. Now, let’s lower the intensity of optical feedback by applying a screen between the receiver and the emitter. The device will respond – the generation frequency will alter or stop. Light pulse generator. The circuit is based on the composite avalanche transistor VT1, VT2. The pulse repetition frequency is calculated with the help of the time constant according to the following formula *(С1 + С2). The generator produces pulses at the frequency of 2…3 Hz. If the stub of intrusion protection B1 breaks, that is, the circuit of capacitor С1 opens, the pulse frequency significantly increases, which leads to activation of the alarm. Generators with electromechanical feedback. The device is based on a relay with a time-setting RC-circuit. When power is supplied, capacitor C1 charges through the normally closed contacts of the relay and resistors R1 and R2. In a certain amount of time the relay will go off, and its contacts will open the charge circuit. For a period of time the relay will be fed by capacitor C1, after which the contacts will close again and the charge process will be repeated. The time of the charge/discharge cycle for capacitor C1 can be adjusted with the help of potentiometer R2. Generators with acoustic feedback. Circuit-wise, this is the simplest low-frequency amplifier. The input has an acoustic sensor, like a cup, and the output – a sound projector. When the two acoustic elements are put closer to each other, the generator switches to the automatic oscillations mode. When the acoustics, i.e. emitters, are periodically moved, the device produces acoustic signals. This type of generator can be used to indicate the reflection of sound waves or as a protection device.