FM surveillance BuG Transmitter using 2N2222 Nov 7, 2008 … The Circuit shown can transmit voice to exceptionally good range. Tune trimmer to hear the signal to your near radio. Frequency range is …

FM telephone bug Jun 18, 2010 … A simple telephone transmitter circuit that is ideal for transmitting the telephone conversation through small distances.The circuit is very simple …

Mobile Bug Detector using CA3130 Sep 6, 2010 … This handy, pocket-size mobile transmission detector can sense the presence of an activated mobile phone from a distance of one-and-a-half …

Bug Detector Circuit Mobile Bug Detector using CA3130. Monday, September 6th, 2010. This handy, pocket-size mobile transmission detector can sense the presence of an activated …

Telephone Listening Bug with FM Transmitter by A933 Mar 7, 2008 … Here is a simple transmitter that when connected to a phone line, will transmit anything on that line (execpt the dial tone) to any FM radio.

Telephone Listening Bug by A933 Jul 12, 2008 … Here is a simple transmitter that when connected to a phone line, will transmit anything on that line (execpt the dial tone) to any FM radio.

Speaker Protection Circuit kit If you are one person at fears a loudspeaker and power amplifier. Be damaged I begs for to advise Speaker Protection Circuit KIT. Convenient for friends at not convenient seek buy the equipment and do PCB by oneself. When you buy this Electronic KIT….

Loudspeaker Protection with Soft Start This is a small protection circuit from loudspeakers, from DC voltage that likely to exist after some damage in the power amplifier. If a DC voltage is presented in the exit of amplifier, RL1 it interrupts immediately the line of loudspeakers preventing thus to reach in he. Parallel it provides a delay time of 3 seconds from the moment where the power supply …

Protection Circuits for Audio Amplifiers he photovoltaic isolator makes for a simple, easy, way to turn the two units on or off because the voltage-source side of the isolator rides along with the source terminals while the LED side may be tied to any level necessary for operation. To turn the “relay”….