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Detailed entries for one subject from the INDEX TO HOW TO DO IT INFORMATION.
Click on a see also (sa) or tracing (xx) to view detailed entries about a related subject.
The entries are in alphabetical order by magazine name and then in chronological sequence.
To obtain a copy of any magazine article contact your local public library or the publisher.


Telephone line grabber. This listening circuit can be called from a remote phone so you can intercept phone conversations or monitor room activities. Est. cost: $100 (kit).

Tele monitor lets you keep an audible record of your telephone conversations. This device activates a recorder when the phone is picked up. Est. cost: $25

Induction pickup coil for recording or amplifying telephone conversations.
ELECTRONICS ILLUSTRATED Jan 1965 (v.8#1) pg. 96

The 008 Tele-Spy, a device which is connected to a telephone line. When the device is turned on, it will answer the telephone before it rings and enable the caller to hear every sound in the room for a specified length of time, and then break the circuit.
ELECTRONICS ILLUSTRATED Jan 1967 (v.10#1) pg. 83

Phone beeper. Device emits an audible beep every 15 seconds. Needed to comply with FCC regulations for recording telephone conversations. This battery powered device has five transistors. Est. cost: $10.
ELECTRONICS ILLUSTRATED Nov 1967 (v.10#6) pg. 72

Telephone line grabber. This listening circuit can be called from a remote phone so you can intercept phone conversations or monitor room activities.
ELECTRONICS NOW Sep 1994 (v.65#9) pg. 43

Telephone projects for the hobbyist. (1) Tele-Guard allows you to detect a listening device (bug) or an open telephone extension. (2) Telephone hold button. (3) Telephone melody ringer.
HANDS-ON ELECTRONICS Sep-Oct 1986 (v.3#5) pg. 60
Correction HANDS-ON ELECTRONICS Jan 1987 (v.4#1) pg. 4

Circuit for a "telephone bug" which is wired into a telephone circuit and allows you to eavesdrop on a ordinary FM receiver.
HANDS-ON ELECTRONICS Dec 1986 (v.3#7) pg. 22
Correction HANDS-ON ELECTRONICS Apr 1987 (v.4#4) pg. 6

Telephone transmitter lets you monitor a phone call on any transistor radio.
HANDS-ON ELECTRONICS Apr 1987 (v.4#4) pg. 89

Switch turns on a tape recorder whenever the telephone is off-hook.
HANDS-ON ELECTRONICS Oct 1987 (v.4#10) pg. 95

Unlock the mystery of voice/remote activation circuits. Expand the usefulness of portable cassette recorders with these circuits. (1) Extended-play circuit slows down the rate of tape travel. (2) Sound-activated tape switch starts recorder when sound is detected. (3) Telephone auto-record circuit records telephone calls coming in and going out from the same phone line.
HANDS-ON ELECTRONICS Nov 1987 (v.4#11) pg. 84

The Frustrator. Phone device thwarts would-be telephone pitchmen and other annoying callers, but lets through calls you want to receive. The ringing phone is answered with silence, but voice or Touch-Tone signals are heard on a speaker. You have 30 seconds to decide to "answer" the phone yourself.
MODERN ELECTRONICS [2] Mar 1985 (v.1#6) pg. 48

Tattle Tale. A unique home or office intruder and emergency monitor that you phone to find out if all is well. Can be used to monitor up to three emergency situations (breakin, fire, flood, heating/cooling failure, etc.).
MODERN ELECTRONICS [2] Dec 1986 (v.3#12) pg. 28

Telephone transmitter. Connected in series with a phone line, this device "steals" power from the phone line and transmits both sides of a conversation to an FM radio. Est. cost: $10 (kit).

Interface circuit for attaching a cassette recorder to the phone line draws operating power from the telephone line itself. This recorder starts whenever a phone is taken off hook or whenever an answering machine is activated. Used to capture all telephone conversations.
POPULAR ELECTRONICS [2] May 1989 (v.6#5) pg. 87

Tele monitor automatically activates a recorder to keep a log of all calls, incoming or outgoing. Est. cost: $25.
POPULAR ELECTRONICS [2] Jun 1989 (v.6#6) pg. 33
Correction POPULAR ELECTRONICS [2] Oct 1989 (v.6#10) pg. 4

Telephone accessory circuit will trigger any tape recorder to take messages.
POPULAR ELECTRONICS [2] Feb 1991 (v.8#2) pg. 25

Telephone circuit parade. (1) Neon lamp acts as a ring indicator. (2) Telephone recording control will activate a tape recorder any time the phone is taken off hook. (3) Telephone indicator (tester) will tell when a phone is off hook, the dialing method used, and which digit was pressed or dialed.
POPULAR ELECTRONICS [2] Aug 1992 (v.9#8) pg. 76, 88

Build an audio interface for your telephone to record conversations with the highest possible audio quality. Est. cost: $15 (kit).
POPULAR ELECTRONICS [2] Dec 1993 (v.10#12) pg. 61

Build a telephone transmitter. Listen-in on telephone conversations on any FM radio. Transmits both sides of a conversation to an FM radio tuned to between 90 and 95 MHz. Est. cost: $10 (kit).
POPULAR ELECTRONICS [2] Jan 1996 (v.13#1) pg. 37

Telephone pickup coil slips over the receiver.
POPULAR MECHANICS Sep 1967 (v.128#3) pg. 181

Build this remote telephone ear. Lets you monitor sounds in your home or office when you call your telephone from a remote location.
RADIO-ELECTRONICS Dec 1978 (v.49#12) pg. 67

Record/play telephone accessory. Switch will turn a tape recorder on when receiver is lifted. Use it to record phone conversations and to play back the recording.
RADIO-ELECTRONICS Jun 1979 (v.50#6) pg. 62

Circuit that turns on a cassette recorder whenever the telephone rings so you can tape your calls.
RADIO-ELECTRONICS Oct 1989 (v.60#10) pg. 8
Correction RADIO-ELECTRONICS Dec 1989 (v.60#12) pg. 14