There are 74 circuit schematics available in this category. Click here for all circuit diagrams. The Last circuit was added on Sunday, February 19, 2017.Please note some adblockers will suppress the schematics as well as the advertisement so please disable if the schematic list is empty.

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CircuitCategoryDate AddedOK?Votes 
GSM-900 Mobile Jammer Book (PDF compressed with WinRAR)TelephoneAug 01, 2010Status0 vote up vote down
Portable GSM900 Cellular Phone JammerTelephoneAug 01, 2010Status0 vote up vote down
High Power 800 MHz/AMPS Cellular Phone JammerTelephoneAug 01, 2010Status0 vote up vote down
Cellular Phone Jammer. Ver 2 circuit diagramTelephoneAug 01, 2010Status0 vote up vote down
Portable AMPS Cellular Phone JammerTelephoneAug 01, 2010Status1 vote up vote down
Portable AMPS Cellular Phone Jammer - Dual PurposeTelephoneAug 01, 2010Status-1 vote up vote down
PCS Phone Jammer circuit diagramTelephoneAug 01, 2010Status0 vote up vote down
Portable PCS Cellular Phone Jammer circuit schematicTelephoneAug 01, 2010Status0 vote up vote down
PCS Cellular Phone Jammer circuit schematicTelephoneAug 01, 2010Status0 vote up vote down
GBPPR Cellular Phone Jammer Exciter schematic diagramTelephoneAug 01, 2010Status1 vote up vote down
Cellular Phone Jammer RF Amplifier circuit diagramTelephoneAug 01, 2010Status0 vote up vote down
Homebrew P2JBZ-style cellular / mobile phone jammer circuitTelephoneAug 01, 2010Status0 vote up vote down
FM Telephone BugTelephone Status1 vote up vote down
Cellular Phone calling DetectorTelephoneSep 17, 2009Status-1 vote up vote down
Simple Phone Tap circuit diagramTelephoneAug 12, 2009Status-2 vote up vote down
Telephone Hold Button circuitTelephoneAug 12, 2009Status-1 vote up vote down
Telephone recorder to record phone conversations automaticallyTelephoneAug 12, 2009Status0 vote up vote down
Cellular Phone calling DetectorTelephoneAug 12, 2009Status0 vote up vote down
Phone line indicatorTelephoneSep 17, 2009Status0 vote up vote down
Isolated Telephone InterfaceTelephoneAug 12, 2009Status0 vote up vote down
Telephone Record Control using 2N4360, 2N2222 and 2N2102TelephoneAug 12, 2009Status0 vote up vote down
Phone In Use Indicator circuit diagramTelephoneSep 17, 2009Status0 vote up vote down
Phone "Hold" With MusicTelephoneAug 12, 2009Status0 vote up vote down
Simple speakerphoneTelephoneAug 12, 2009Status-1 vote up vote down
High Quality Intercom using LM380 amplifier ICTelephoneAug 12, 2009Status0 vote up vote down
Soft Musical Telephone RingerTelephoneAug 12, 2009Status0 vote up vote down
Telephone amplifierTelephoneAug 12, 2009Status-3 vote up vote down
Cut Phone Line DetectorTelephoneAug 12, 2009Status0 vote up vote down
Telephone line monitorTelephoneAug 12, 2009Status0 vote up vote down
Phone Busy IndicatorTelephoneAug 12, 2009Status0 vote up vote down
Ringing Phone Light Flasher using optocoupler and relayTelephoneAug 12, 2009Status0 vote up vote down
Telephone Circuit: Music On HoldTelephoneOct 03, 2013Status0 vote up vote down
Incoming call indicator (ZIP file)TelephoneJan 26, 2001Status0 vote up vote down
Telephone line simulator ideal for testing phone interface projectsTelephoneMay 24, 2010Status0 vote up vote down
Self-powered phone messenger based on a PIC16C819 microcontrollerTelephoneMay 24, 2010Status0 vote up vote down
Phone call interceptor to stop unsolicited phone callsTelephoneMay 16, 2010Status0 vote up vote down
Telephone call screener with voiceTelephoneMay 24, 2010Status1 vote up vote down
Single-Wire-Telephones for caves and minesTelephoneMar 03, 2011Status0 vote up vote down
Simple alarm with telephone dialler interfaceTelephoneMar 27, 2009Status1 vote up vote down
Telephone line simulatorTelephoneMar 05, 2001Status2 vote up vote down
Home made PBX / PABXTelephoneJun 17, 2003Status1 vote up vote down
Ringing Phone Light FlasherTelephoneSep 01, 2009Status0 vote up vote down
Phone Busy IndicatorTelephoneSep 01, 2009Status0 vote up vote down
FM Telephone BugTelephoneSep 01, 2009Status0 vote up vote down
Cut Phone Line DetectorTelephoneSep 01, 2009Status0 vote up vote down
Simple Phone Tap CircuitTelephoneSep 01, 2009Status0 vote up vote down
Telephone Hold ButtonTelephoneSep 01, 2009Status0 vote up vote down
Telephone RecorderTelephoneSep 01, 2009Status0 vote up vote down
Remote Telephone Bell RingerTelephoneSep 01, 2009Status0 vote up vote down
Build your own radio controlled switch from a cordless telephoneTelephoneNov 16, 2010Status0 vote up vote down
1-line telephone status indicator powered from a 3V battery (PDF)TelephoneJan 26, 2001Status0 vote up vote down
Line in use indicator that handles two independent phone lines (PDF)TelephoneJan 26, 2001Status0 vote up vote down
4-line telephone status indicator that is polarity independent (PDF)TelephoneJan 26, 2001Status0 vote up vote down
Cellular Phone calling DetectorTelephone Status0 vote up vote down
Cellular Phone calling detector (detects RF field)TelephoneFeb 21, 2005Status0 vote up vote down
Telephone music on hold interfaceTelephoneFeb 21, 2005Status0 vote up vote down
Soft musical telephone ringerTelephoneFeb 21, 2005Status0 vote up vote down
Telephone amplifierTelephoneFeb 21, 2005Status1 vote up vote down
Telephone line monitorTelephoneFeb 21, 2005Status0 vote up vote down
Cut telephone line detectorTelephoneFeb 21, 2005Status0 vote up vote down
FM telephone line bug transmitter (88MHz to 94MHz)TelephoneFeb 21, 2005Status0 vote up vote down
Telephone privacy adapterTelephoneJan 26, 2001Status0 vote up vote down
Telephone ringing circuitsTelephoneJan 26, 2001Status0 vote up vote down
Simple circuit to connect telephone equipment to audio mixerTelephoneJan 26, 2001Status0 vote up vote down
Universal telephone holdTelephoneJan 26, 2001Status0 vote up vote down
Talking phone dial monitor (PDF)TelephoneJan 26, 2001Status0 vote up vote down
Simple Skype VoIP analog adapterTelephoneSep 10, 2006Status0 vote up vote down
Simple intercom circuit diagramTelephoneOct 25, 2009Status-1 vote up vote down
Assorted telephone circuits (ring generator, in-use indicator, audio interface)TelephoneMar 18, 2003Status-1 vote up vote down
Cut phone line detectorTelephoneJan 08, 2002Status0 vote up vote down
DSL / ADSL phone line filterTelephone Status0 vote up vote down
Greek telecard readerTelephoneApr 17, 2004Status0 vote up vote down
Isolated Telephone Interface (phone tap) for tape recorder, PC sound card etcTelephoneSep 21, 2006Status-1 vote up vote down
High power mobile phone Jammer circuitTelephoneJun 28, 2016Status-1 vote up vote down