Bird voice simulator. Scheme, description

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ENCYCLOPEDIA OF RADIO ELECTRONICS AND ELECTRICAL ENGINEERING
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Bird voice simulator. Encyclopedia of radio electronics and electrical engineering

Free technical library

Encyclopedia of radio electronics and electrical engineering / Calls and audio simulators

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This simple device can help bring a child's toy to life, but it could have other uses as well.

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The electrical circuit allows you to imitate the voices of birds. So, with a capacitance C5 - 0,015 microfarads, the sound will be similar to the squeaking of chicks, and when connected in parallel (switch S1) another capacitance C4 - 0,068 microfarads - the cry of seagulls.

Having carried out small experiments with the value of capacitors C4, C5 and resistor R3, you can get many other bird voices. The interval between sounds depends on the values of R2 and C2.

See other articles Section Calls and audio simulators.

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HEP-100/150/185 - power supplies for harsh environments 26.11.2015

If you are looking for a fanless power supply capable of continuous operation in the temperature range of -55...+70°C, in an environment with high humidity, dust and high vibration, then the new series of power supplies HEP-100, HEP-150 and HEP-185 from Mean Well.

New power supplies have an output power of 100, 150, 185 W, respectively, an extended input voltage range of 90...305 V, increased efficiency (94%) and the ability to work at altitudes up to 5000 meters. The new power supplies are manufactured in an aluminum case with compound casting in two versions: with the possibility of manual adjustment of the output voltage (IP65) and without voltage adjustment (IP68). All power supplies have a power factor correction circuit (>0,95). In terms of electromagnetic compatibility, the power supplies meet the requirements of EN55022 (CISPR22) for class B, have protection in the input circuit against short-term impulses of increased energy with an amplitude of up to 6 kV and a warranty period of 6 years.

These power supplies are designed for industrial equipment operating in harsh environments in telecommunications, oil and mining industries, as well as for outdoor advertising and architectural and decorative lighting.

Main technical parameters:

Output power 100, 150, 185 W;
Output voltage from a range: 12, 15, 24, 36, 48, 54 V;
Operating mode: voltage stabilization;
Power factor >0,95;
Efficiency up to 94%;
Temperature range -55...+70°С;
Input voltage range 90...305 V;
Vibration resistance up to 10G;
IP65/68;
Protection against impulses up to 6 kV;
Protection against short circuit, overload, overvoltage and overheating;
6 year warranty.

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