Can hear sounds through glass panels or walls. Battery operated Sensitive amplifier, low noise amplifier with up to 5000x amplification, so even the smallest noise sources can be heard loudly in headphones.
Two switchable filter stages (high and low pass) allow the frequency response to be influenced in a targeted way, Automatic volume control (ALC) ensures a constant volume level and protects the ears from sudden sound spikes.
The amplifier allows the connection of a wide range of microphones, such as electret, parabolic and others. The TDA7052 1 W BTL mono amplifier IC is used to strengthen the sound output and enable use with headphones.
Sensitive amplifier Technical data:
- Power supply: 9V Battery
- Current consumption: max. 20mA
- Frequency response: 35 Hz to 7.5 kHz (-3 dB)
- Gain: max. 73 dB (5000x)
- High pass filter: fg = 150 Hz (switchable)
- Low pass filter: .. fg = 5 kHz (switchable)
- Output: Headphone (stereo)
- Other: automatic volume control (ALC)
- Dimensions: 65x115x26mm
Amplifier Listening Device Circuit Diagram
Attention: Listening and recording conversations between people is a crime. This circuit is educational and experimental. Do not use it for purposes other than its intended purpose.
Source: de.elv.com/p/fein-hingehoert-lauschverstaerker-lv100-P201468/
