Friends of Andrew Morris needed a device that could detect a stroke victim's groan and convert the sound into a signal so caregivers would know when help was needed.
After trying unsuccessfully to create a device that could detect the characteristics of the victim's groan, Andrew remembered an answering machine -- from 30 years ago -- that could detect gaps and brief interruptions in the audio that helped the machine detect the difference between a dial tone and a human voice. So Andrew designed a circuit to do just that, thus giving the stroke victim the voice to call for assistance.
Click the image below to see more of the gadget.
| Amt |
Part Description |
Allied Part # |
| 2 |
Conn; AV; Power; Jack; Mini; 2.0mmPinDia; Str; SldrLugs; LongBushing; forS760, S760K, S761K |
70214189 |
| 2 |
PowerSupply; AC-DC; 5V@1A; 90-264V In; WallPlug; Retail; Switching; 5W; GS Series |
70069886 |
| 1 |
Switch; Panel; 250 mA; Solder Terminal; Copper Alloy (ROHS); Mount hdwr supplied |
70214234 |
| 1 |
Switch, Pushbutton; Panel Mount; 1000 V(RMS) (Min.); 0.5 A; Wire Lug |
70156111 |
| 2 |
Toggle Switch; SPDT; RoHS Compliant |
70155934 |
| 1 |
SWITCH, TOGGLE, SUBMINIATURE, BAT LEVER, THREADED BUSHING, SOLDER LUG, DPDT |
70192084 |
| 1 |
Knob; Control; Dia 19/32in; Line or Slot; Thermoset |
70097796 |
| 1 |
Knob; Phenolic, Brass (Bushing); 21/32 in.; 1/4 in.; 15/32 in.; 6-32 |
70097793 |
| 1 |
Transducer; 40 mA (Max.); 5 VDC; 2400 Hz; -40 to degC; Pin Termination |
70115802 |
| 1 |
Pot; Cnd Pl; Rest 10 Kilohms; Panel; 1 Turn; Linear; Pwr-Rtg 0.5W; Shaft Dia 0.25In |
70153802 |
| 1 |
Pot; Cnd Pl; Rest 100 Kilohms; Panel; 1 Turn; Linear; Pwr-Rtg 0.5W; Shaft Dia 0.25In |
70153811 |
| 2 |
5MM GREEN LED, LAMP THOLE, BULK |
70062998 |
| 1 |
LED; 3MM BLUE LED |
70052924 |
| 6 |
Resistor; Carbon Film; Res 10 Kilohms; Pwr-Rtg 0.25 W; Tol 5%; Axial; Cer-Core |
70022898 |
| 3 |
Resistor; Carbon Film; Res 47 Kilohms; Pwr-Rtg 0.25 W; Tol 5%; Axial; Cer-Core |
70024004 |
| 3 |
Resistor; Carbon Film; Res 100 Kilohms; Pwr-Rtg 0.25 W; Tol 5%; Axial; Cer-Core |
70022899 |
| 4 |
Resistor; Carbon Film; Res 22 Kilohms; Pwr-Rtg 0.25 W; Tol 5%; Axial; Cer-Core |
70022904 |
| 2 |
Resistor; Carbon Film; Res 3.3 Kilohms; Pwr-Rtg 0.25 W; Tol 5%; Axial; Cer-Core |
70024003 |
| 3 |
Resistor; Carbon Film; Res 330 Ohms; Pwr-Rtg 0.25 W; Tol 5%; Axial; Cer-Core |
70022911 |
| 1 |
Resistor; Carbon Film; Res 1 Megohms; Pwr-Rtg 0.25 W; Tol 5%; Axial; Cer-Core |
70023761 |
| 3 |
Resistor; Carbon Film; Res 1 Kilohms; Pwr-Rtg 0.25 W; Tol 5%; Axial; Cer-Core |
70022897 |
| 1 |
Transistor: 200mA 625mW NPN General-Purpose Amplifier, TO-92 |
70055539 |
| 2 |
Op Amp, Dual; 32 VDC (Max.) (Single Supply); 5 V (Max.); PDIP-8 |
70099598 |
| 1 |
MOSFET; N-Ch; VDSS 90VDC; RDS(ON) 1.8 Ohms; ID 0.5A; TO-92 (TO-226); PD 350mW; -55degc |
70099793 |
| 1 |
8-Pin, 384 B Flash, 16 RAM, 4 I/O |
70045452 |
| 1 |
8-Pin, 768 B Flash, 25 RAM, 6 I/O |
70045469 |
| 4 |
Socket, DIP; 8Pins; Dual Leaf; Open; SolderTail; 0.31In.; Beryllium Copper; Tin |
70084221 |
| 1 |
Punchboard, Unclad; FR2 Phenolic; 4.5 in. W x 6.5 in. L; 0.062; 0.042; FR2 |
70219600 |
| 2 |
Capacitor; Ceramic; Cap 0.1 uF; Tol 10%; Vol-Rtg 50 VDC; Radial; X7R; Bulk |
70122993 |
| 3 |
Capacitor; Ceramic; Cap 0.01 uF; Tol 20%; Vol-Rtg 50 VDC; Radial; X7R; Bulk |
70123005 |
| 2 |
Capacitor; Ceramic; Cap 1 uF; Tol -20, +80%; Vol-Rtg 50 VDC; Radial; Y5V; Tape & Reel |
70122939 |
| 2 |
Capacitor; Al Electrolytic; 100uF; 10VDC; 20%; Radial; 5.0mmDia.; 11.0mmL; 13VDC |
70111819 |
| 2 |
Capacitor; Aluminum Electrolytic; Cap 10uF; Vol-Rtg 16V; Radial; nHg |
70067785 |
| 1 |
Diode, Small Signal; 300 mA; 100 V (Min.); 1 V (Max.); 440 mW; 350 K/W; 100 V |
70061726 |
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