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Minute Man Electronics

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40 Second Message Recorder with Looping Option.40 Second Message Recorder with Looping Option.
Philmore DATAKit # 80-146

The circuit uses an information Storage Devices Corp. No. ISD2540 chip to store one or more audio/voice messages up to forty seconds (maximum time). If desired, the first message can be looped so that it plays repeatedly. Non-volatile; the messages) is/are retained even when the power is removed.

Output is to a user-supplied four or eight ohm speaker. The output volume is low, you may wish to add an LM386 amplifier kit (No. 80-170) or another amp to increase the volume for your application.

The same circuit could be used with any of the ISD25xx chips in the series up to 120 seconds record time. Operates on 6 volts at 100mA maximum.

We suggest you also order a soldering tool kit to make this project. Click here to go to this item (# S540).

 Click Here For Picture Of Soldering Kit # S540.


Price:  $53.03 


Sound Effects Generator
Philmore DATAKit # 80-106

Another novel circuit that might be useful for special theatrical effects. Or if you are simply a practial joker. The circuit can produce sounds such as a tick-tock of a grandfather clock, a heart monitor (as in the hospital), water on a tin roof, a motor boat, cricket, etc..

Requires a 9 volt battery. Includes its own speaker. 


Price:  $9.32 

Sound Effects Generator


Voice ChangerVoice Changer
Philmore DATAKit # 80-105

This very popular kit will change your voice to add a vibrato, like those used to disguise secret witnesses. Or, you may change your voice tone upward or downward; women sound like men and vise versa. Includes a very ROBOTIC voice as well.

A microphone and speaker are included on the PC board, all that you need to add is a nine volt transistor battery. This is a very novel and entertaining circuit.  


Price:  $15.81 


Sound Activated Switch for Tape Recorder (VOX Switch)
Philmore DATAKit # 80-130

Turn on any tape recorder that has remote on/off jack(most cassettes). The circuit has feed back and delay circuit for robust operation. You could add a relay for switching heavy loads; and tape recorders are not the limit. How about turning on lights via voice or a whistle? Circuit switches off after 6 seconds of silence.

Picture shows PCB included with the kit. 


Price:  $20.73 

Sound Activated Switch for Tape Recorder (VOX Switch)


Stereo VU MeterStereo VU Meter
Philmore DATAKit # 80-880

This is a very eye appealing audio accessory. Displays an approximate output level for each channel of stereo amplifier.

Connects to the speaker terminals, levels are displayed in ten discrete steps. User may select a moving dot bar appearance.

Uses two LM3915 IC’s, includes a discussion of measuring audio power.  


Price:  $31.74 


Four Train Sound Effects
Philmore DATAKit # 80-910

Ideal for most railroads, produces the whistle, train chugging sound, crossing bell and the clickety-clack of crossing a bridge. 


Price:  $23.74 

Four Train Sound Effects


Mini-VOX & Relay Kit (Sound Activated Switch)Mini-VOX & Relay Kit (Sound Activated Switch)
Philmore DATAKit # 80-126

For the uninitiated, VOX = Voice Activated Switch. This is a switch (relay) that may be activated with any sound, including the human voice.

A very sensitive circuit that may be adjusted to react to very low volume sounds or a yell or hand clap. While a VOX is often used to activate a sound recorder, it may be used to trigger an alarm (the mike easily picks up vibrations in windows, wall or door), activate a video camera, radio transmitter or simply turn on a light.

The relay will release after a few seconds of silence, holding as long as sound continues. (hold time may be changed up to 30 seconds). Unit operates on 12V DC and very low current.

We suggest you also order a soldering tool kit to make this project. Click here to go to this item (# S540).

 Click Here For Picture Of Soldering Kit # S540.


Price:  $22.31 

Minute Man Electronics

Unique Products and Components
$20 Minimum
Merchandise Order
Thank You