Case #102: Dick Had a Cameo Role in Scream 2

By Design News Staff -- Design News, October 23, 2006

Give the little witches and warlocks a real trick when they come clamoring for treats on Halloween with this doorbell-activated soundtrack. All that's required to build this spooky sound generator is a moderate hack of a cassette player, which involves opening the case and rewiring the motor for remote control, and rewiring of your doorbell circuit. Add a simple, roof-mounted speaker, and you'll have the little darlings scattering in every direction at the first blood-curdling scream.

Download the Build Instructions

SPOOKY SOUND GENERATOR
Amt	Part Description	Allied Part #
1	1K 1/2W Resistor	296-2187
1	100 ohm 1/4W Resistor	296-5514
1	47 ohm 1/4W Resistor	296-2178
1	SCR	568-0639
1	K1 Relay 12V ac	850-0546*
1	K2 Relay 12V dc	866-2554
1	PSU1 12V dc power supply	928-9720
* or 24Vac 866-2020 (see text)
Additional parts required
R4 10 ohm resistor, rating appropriate for Cue Channel output (needed if the Cue Channel amplifier has an output transformer); Stereo tape player or tape deck and amplifier configured for electrical remote control (see instructions); Continuous-loop tape cassette (TDK EC-3M or similar). EC-3M is a 3-minute loop. One vendor informs me that TDK is the only current maker of loop cassettes and this is the shortest loop they make.

related stories
resource center
by this author

View more articles by Staff Staff

Technology Marketplace

Article tools sponsored by

Talkback

Ah, Memories... I built a number of simpler devices in the '70s for the Livonia Mich. Jaycees...
- 2006-10-31 06:22:22
Sorry about the parts list, folks, and then I swapped K1 & K2 in my comment to correct...
- 2006-10-14 05:32:49
Sorry about the parts list, folks. This might get hard to read if line breaks are not...
- 2006-10-13 22:04:58

» MORE

DN's Resource Center Get Free Information, Made Easy

Understanding a Modular Instrumentation System for Automated Test
National Instruments | White Paper
Request Item
Advanced Features of High Speed Digital I/O devices : White Paper Series
National Instruments | White Paper
Request Item

View all DN resources >>

Design News Partner Zones

CAD/CAE Model Clean-Up: Reduce Iterative Cycles
This webinar featured research and survey results related to problems associated with preparing CAD geometry for CAE applications. We discussed how Recipe-Based Automation can help create "just-in-time" CAE-ready geometry each time a cad model is updated. Watch the Presentation

Light Matters: Systems Level Approach to HBLED illumination applications
Its good practice to apply a systems-level approach to high-brightness LED (HBLED) illumination applications. Minimally, the system includes the optical, thermal and electrical characteristics of the of the HBLED, the lens (if any) which is built-in to its package, secondary optics such as external plastic lenses/reflectors to direct the light as your application requires and power driver electronics. Read More

Design Engineers' Portal for Sensing and Machine Safety
Whatever industry you're in, or whatever product you manufacture, the right sensors to automate your plant, and to improve your overall efficiency, quality and safety are a must. You'll find Banner Engineering to be an amazing resource of products, training and people with expertise.