I was playing around with some cheap CCTV microphone modules and managed to create a monophonic spy ear bug for common DVRs. They can be directly powered from the existing CCTV camera power supply ...

Do you remember the cctv microphone review published a while ago? (https://www.edn.com/cctv-microphone-review/). This is a continuation of that post. This time my ...

Two-way audio is standard on most consumer security cameras these days. Most people try it once, talk to their dog through the mic, laugh at the delay, and never think about it again. That’s a shame, ...