Radioddity RD-301 Tri-Band Antenna SMA-Female 144/220/440MHz 2M/1.25M/70CM Compatible with Baofeng UV-5RX3 UV-82X3 BTECH UV-5X3 Kenwood TH-D74A Radioddity GA-2S Walkie Talkie Two Way Radios
Genuine quality antenna at a good price, with extended reception/transmission and wide frequency coverage..
1/4 wave at 144MHz, 1/2 wave at 220MHz and 5/8 wave at 440MHz.
Short and portable, easy to carry out for outdoor activity. Ideal size for use around the house and yard or while hiking/exercising..
Compatible with all Baofeng UV-5RX3, Btech UV-5X3, Kenwood TH-D74A, etc.
This high gain HT antenna built with a flexible whip, length up to 8 inch. Just increase the performance on your handheld walkie talkie or wideband....
ACEIRMC 2pcs MAX9814 Electret Microphone Amplifier with Auto Gain Control for Arduino
1.The MAX9814 is a high-quality microphone amplifier with automatic gain control (AGC) and low-noise microphone bias. The device features a low-noise preamplifier, variable gain amplifier (VGA), output amplifier, microphone-bias-voltage generator and AGC control circuitry..
2.A trilevel digital input programs the output amplifier gain. An external resistive divider controls the AGC threshold and a single capacitor programs the attack/release times..
3.The low-noise preamplifier has a fixed 12dB gain, while the VGA gain automatically adjusts from 20dB to 0dB, depending on the output voltage and the AGC threshold. The output amplifier offers selectable gains of 8dB, 18dB, and 28dB. With no compression, the cascade of the amplifiers results in an overall gain of 40dB, 50dB, or 60dB..
4.The MAX9814 is available in the space-saving, 14-pin TDFN package. This device is specified over the -40°C to +85°C extended temperature range. MAX9814: Simplified Block Diagram MAX9814: Simplified Block Diagram Enlarge+.
5.A trilevel digital input programs the ratio of attack-to-release time. The hold time of the AGC is fixed at 30ms. The low-noise microphone-bias-voltage generator can bias most electret microphones..