Recording circuit of phone conversations using PC – Circuit Schematic
Recording circuit of phone conversations using PC
This circuit is used to record telephone conversations on your landline telephone. All you will need is this small circuit and subscription of your PC. There ar...
Automatic telephone call recording circuit – Circuit Schematic
Automatic telephone call recording circuit
DC voltage present on the telephone line is usually about 45 to 50V, on-hook and off-hook to 6V. The step-down circuit relay is activated. Relay control tape re...
Automatic telephone call recording circuit – Circuit Schematic
Automatic telephone call recording circuit
DC voltage present on the telephone line is usually about 45 to 50V, on-hook and off-hook to 6V. The step-down circuit relay is activated. Relay control tape re...
Limited TV channels to increase reception circuit – Circuit Schematic
Limited TV channels to increase reception circuit
Circuit uses two features: one is the integrated electronic tuner with AV output (commonly known as the tuner) which can be received CATV full channel TV signa...
Homemade small telephone PBX circuit diagram – Circuit Schematic
Homemade small telephone PBX circuit diagram
Circuit principle outside into the phone when ringing pulses through C1, R1, D2 to C2 charging voltage in 6V, this voltage causes N1, N2 reverse, V1 analog hoo...
Automatic telephone answering and ringtones indicator circuit diagrams – Circuit Schematic
Automatic telephone answering and ringtones indicator circuit diagrams
Check loop circuit for automatic telephone answering or tone generator for use reverse automatic repair. ...
Cordless telephone voice processing circuit diagram – Circuit Schematic
Cordless telephone voice processing circuit diagram
CX9800 models of mobile phones and desktop PC have chosen excellent performance voice processing circuit, the amplitude and bandwidth of the microphone signal ...
Telephone relay circuit – Circuit Schematic
Telephone relay circuit
By cross-connect telephone ringing circuit, when the phone rang, the circuit closes the relay. It uses the delay in contact, thus to drive any bells, sirens, b...
Automatic telephone answering circuit diagram – Circuit Schematic
Automatic telephone answering circuit diagram
Automatic telephone responder circuit is shown in Fig. FIG IC2 10 seconds voice recording circuit SR9G10A, press the power switch S2, can be built by IC2 elect...
Automatic recording telephone interface circuit – Circuit Schematic
Automatic recording telephone interface circuit
Automatic recording telephone interface circuit as shown, the circuit has an automatic answering and recording function (need to reprovision or small solid sta...
A multi-purpose radio talk lamp circuit – Circuit Schematic
A multi-purpose radio talk lamp circuit
Ai. A2 series with the telephone line, when the sound wrong or off-hook current is passed lC, inside the arc tube made of light so wins the photosensitive MOSFE...
A circuit diagram of a wireless hands-free telephone device – Circuit Schematic
A circuit diagram of a wireless hands-free telephone device
A wireless hands-free telephone device circuit diagram as follows: ...
Using voice instead of phone ringing message controller circuit – Circuit Schematic
Using voice instead of phone ringing message controller circuit
The call is made using language chip ISD1016 voice instead of using the phone ringing message controller schematic circuit. The controller can store messages, m...
Automatic telephone recording interface circuit optical isolation – Circuit Schematic
Automatic telephone recording interface circuit optical isolation
Optically isolated phone automatic recording interface circuit, IC3 voice module....
Automatic telephone recording interface circuit optical isolation – Circuit Schematic
Automatic telephone recording interface circuit optical isolation
Optically isolated phone automatic recording interface circuit, IC3 voice module....
Examples OFDM modulation system circuit – Circuit Schematic
Examples OFDM modulation system circuit
Examples OFDM modulation system. Seen from the graph, the input data signal (... --- Ol01100), the data signal by the string,...
Examples OFDM modulation system circuit – Circuit Schematic
Examples OFDM modulation system circuit
Examples OFDM modulation system. Seen from the graph, the input data signal (... --- Ol01100), the data signal by the string,...
Port-O-Rotary – Circuit Schematic
Port-O-Rotary
A cellular rotary phone - the dialing takes forever! And here in Colorado - on a 10-digit dialing system - you don`t dare mess up the number. Where do you even ...
Telephone Data Interface circuit – Circuit Schematic
Telephone Data Interface circuit
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Tactical Communications Jammer – Circuit Schematic
Tactical Communications Jammer
Barrage (noise) jammer for VHF/UHF communications. Based around an old TV tuner with its local oscillator tapped and amplified. The tuner`s voltage tune line is...