Audio decibel meter schematic

Probe high frequency needle JTK-50L-Q has 5 needles in the high frequency needle

Car Audio Crystal 3.2*2.5mm 3225 24M (24.000MHZ) 20PF 10PPM 20PPM 30PPM

The audio decibel circuit uses it not only as a radio device designed for the SA604, but receives a signal strength indicator (RSSI). In cellular radios, the radio's microcomputer uses this feature to continuously monitor the strength of the received signal. This circuit is proportional to the input signal level of a logarithmic response. The logarithmic response can be provided by the SA604 with an operating frequency range of 80 dB to 15 MHz.