High Quality Intercom - A very high quality intercom, which may also be used for room monitoring __ Designed by Andy Collison
Intercom Preamp - A very convenient way of making an intercom is to use a loudspeaker as a microphone. This is a preamp with a low input impedance suitable for this purpose __ Designed by Richard Torrens
Intercom systE - M - When I was 12 years old, I gained all the parts and skills I needed to make a 2-way intercom system. It consisted of a speaker at the near end, a speaker at the far end, an audio amplifier from a record player, an impedance matching transformer, and a 4PDT "push to talk" switch which reversed the roles of the two speakers __ Designed by Markus Wandel
Intercom using LM386 - Keep in touch with your family members from one room to another and also from outside areas such as the garage, using this intercom circuit for bidirectional communication. The advantage of __ Electronics Projects for You
Intercom with fader - Suitable for tandem bicycles and motor cycles. Connects to iPod and similar MP3 audio players. __ Contact: Flavio Dellepiane, fladello @ tin.it
Intercom with Musical Ringtone - Here’s a low-cost two-way intercom circuit with musical ringtone that can be made using readily available components (see Fig.1).Melody generator IC UM66 (IC1) generates ringtone for the intercom circuit. The __ Electronics Projects for You
Intercom with speaker as microphone - A very convenient way of making an intercom is to use a loudspeaker as a microphone. This is a preamp with a low input impedance suitable for this purpose __ Designed by Richard Torrens
Intercom-Headset-Microphone (Carbon)-Using Model 34 - No description, just schematicOpAmps Lab Inc is the manufactor ofAmplifiers (Video / Audio / Distribution / Microphone / Equalization / Line / VCA / Power), Switchers (Routing / Assign / Matrix), Mult (Press) (Network-Feed) Boxes, Audio Transformers, Oscillators, Power-Supplies, Custom Sub-Systems. __ Application OpAmps Lab Inc.
InterCommunication - This is a great intercom circuit that can be used in many ways. It uses 22V to operate and maybe it will work at a lower voltage (you can try it). For input/output it uses a loundspeaker (20-45 Ohm) on each side.
Intercom-Party-line-Using Model 34 - No description, just schematicOpAmps Lab Inc is the manufactor ofAmplifiers (Video / Audio / Distribution / Microphone / Equalization / Line / VCA / Power), Switchers (Routing / Assign / Matrix), Mult (Press) (Network-Feed) Boxes, Audio Transformers, Oscillators, Power-Supplies, Custom Sub-Systems. __ Application OpAmps Lab Inc.
LOW – COST TRANSISTORISED INTERCOM - Several intercom circuits have appeared in EFY using integrated circuits. The circuit described here uses three easily available transistors only. Even a beginner can easily assemble it on a piece of __ 01/01/2007EFY
Low cost transistorised intercom - This is a circuit for a low cost intercom that is made by using transistors. __ Designed by Electronics Projects for You
Low Power Op-Amp-Audio Amp Intercom - The example below illustrates using an op-amp as an audio amplifier for a simple intercom. A small 8 ohm speaker is used as a microphone which is coupled to the op-amp input through a 0.1uF capacitor. The speaker is sensitive to low frequencies and the small value capacitor serves to attenuate the lower tones and produce a better overall response. You can experiment with different value capacitors to improve the response for various speakers. The op-amp voltage gain is determined by the ratio of the feedback resistor to the series input resistor which is around one thousand in this case __ Designed by Bill Bowden
Low-Cost Transistorised Intercom - Several intercom circuits have appeared in EFY using integrated circuits. The circuit described here uses three easily available transistors only. Even a beginner can easily assemble it on a piece of __ Electronics Projects for You
Low-cost Transistorised Intercom - The circuit described here uses three easily available transistors only. Even a beginner can easily assemble it on a piece of veroboard. The circuit comprises a 3-stage resistor- capacitor coupled amplifier. When ring button S2 is pressed, the amplifier circuit formed around transistors T1 and T2 gets converted into an asymmetrical astable multivib-rator generating ring signals. These ring signals are amplified by transistor T3 to drive the speaker of earpiece. |