The music IC module contains soundgeneration ICs and supporting components
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The music IC module contains soundgeneration ICs and supporting components

It can play sev eral musical tunes that are recorded in it Its actu al schematic is complex and looks like this This module has two different control inputs The OUT connection pulls current into the module not out of it usually from a speaker This c

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The music IC module contains soundgeneration ICs and supporting components




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Page 1
The music IC module contains sound-generation ICs and supporting components. It can play sev- eral musical tunes that are recorded in it. Its actu- al schematic is complex and looks like this: This module has two different control inputs. The OUT connection pulls current into the module (not out of it), usually from a speaker. This current is adjusted to make the music. Snap Circuits proj- ects 15 and 16 show how to connect this part and what it can do. Its Snap Circuits connections are like this: (+) HLD OUT (–) TRG Music for ~20 sec on power-up, then hold HLD to (+) power or

touch TRG to (+) power to resume music. Music IC: (+) - power from batteries (–) - power return to batteries OUT - output connection HLD - hold control input TRG - trigger control input The alarm IC module contains a sound-genera- tion IC and supporting components. It can make several siren sounds. Its actual schematic looks like this: This module has three control inputs, and can make five siren sounds. The OUT connection pulls current into the module (not out of it), usual- ly from a speaker. This current is adjusted to make the siren sounds. Snap Circuits project 17 shows a simple way to

connect this part, and proj- ects 113-117 show the connections needed to make the five possible sounds. Its Snap Circuits connections are like this: Connect control inputs to (+) power to make five alarm sounds. Alarm IC: IN1, IN2, IN3 - control inputs (–) - power return to batteries OUT - output connection IN1 (–) IN2 IN3 OUT Although Snap Circuits includes several parts that are called integrated circuits, they are actually modules containing a number of parts. The mod- ules contain specialized sound-generation and amplifier ICs and other supporting components (resistors, capacitors, and

transistors) that are always needed with them. This was done to sim- plify the connections you need to make to use them.
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The space war IC module contains sound-gener- ation ICs and supporting components. It can make several siren sounds. Its actual schematic looks like this: This module has two control inputs that can be stepped through 8 sounds. The OUT connection pulls current into the module (not out of it), usual- ly from a speaker. This current is adjusted to make the space war sounds. Snap Circuits proj- ect 19 shows how to connect this part and what it can do. Its Snap

Circuits connections are like this: Connect each control input to (–) power to sequence through 8 sounds. Space War IC: (+) - power from batteries (–) - power return to batteries OUT - output connection IN1, IN2 - control inputs IN1 (+) OUT IN2 (–) The power amplifier IC module (not inluded in model SC-100) contains an LM386 audio amplifi- er IC and supporting components. Its actual schematic looks like this: This module amplifies a signal from its input. The OUT connection will usually be directly to a speaker. Amplifiers like this let a small amount of electricity control a much larger

amount, such as using a tiny signal from a radio antenna to control a speaker playing music. Snap Circuits projects 242 and 293 show how to connect this part and what it can do. Its Snap Circuits connections are like this: Power Amplifier IC: (+) - power from batteries (–) - power return to batteries FIL - filtered power from batteries INP - input connection OUT - output connection INP FIL (+) OUT (–) The high frequency IC (not in SC-100) is an TA7642 (or other equivalent) AM radio IC. It is a specialized amplifier used only in high frequency radio circuits. The circuitry looks like this: Its

Snap Circuits connections are like this: This module converts an AM radio signal at its input into an audio signal at its output. Snap Circuits project 242 shows how to connect this part and what it can do. INP INP (–) OUT High Frequency IC: INP - input connection (2 points are same) OUT - output connection (–) power return to batteries
Page 3
The FM Module (not in SC-100 or SC-300) con- tains an integrated FM radio circuit. The inside looks like this: Its actual schematic looks like this: This circuit is actually much more complex than it appears here, since it is built around an

integrated radio circuit. A schematic of the circuitry within this part would be too large to show here, but this block diagram gives a summary of it: Its Snap Circuit’s connections are like this: The antenna ( ) is a loose wire that should always be left unconnected and spread out for best radio reception. Antenna (A1) Antenna Symbol (+) OUT (–) FM Module: (+) - power from batteries (–) - power return to batteries T - tune up R - reset OUT - output connection or The Recording IC (not in SC-100 or SC-300) is a module containing a specialized recording integrat- ed circuit and supporting

resistors and capacitors that are always needed with it. The inside looks like this: Note that the parts here are miniaturized and “sur- face-mounted” to the printed circuit board. The actual recording IC is under the black blob of pro- tective plastic. Its actual schematic looks like this: Its Snap Circuits connections are like this: The recording IC can record and play back a mes- sage up to eight seconds long. There are also three pre-recorded songs. Recording IC (U6) Recording IC (+) OUT (–) Recording IC Module: (+) - power from batteries (–) - power return to batteries RC - record Play -

play OUT - output connection Mic + - microphone input Mic – - microphone input RC Play Mic Mic +
Page 4
Motion Detector The motion detector module (only in SCP-03) contains an infrared detector, amplifier-filter cir- cuit, and timing circuit. Its actual schematic is complex and looks like this: All objects (including people and animals) pro- duce infrared radiation due to the heat in them. Infrared radiation is similar to visible light but has a longer wavelength that our eyes cannot detect. The lens on top of the motion detector module filters and focuses the radiation, it is most

sensi- tive to the radiation produced by our bodies. Inside the motion detector module is an infrared detector with pyroelectric crystals, which create a tiny voltage when exposed to infrared radiation. A circuit amplifies and filters this voltage, but only responds to changes in the radiation level - so is only triggered by moving objects (motion). When motion is detected a timing circuit is used to control other snap circuits devices for a few seonds, such as an alarm. This module is very sensitive and requires a very stable voltage from the batteries, so it should always be used with the 9V

battery holder (B5). The Motion Detector kit SCP-03 shows how to connect this part and what it can do. Other proj- ects with this motion detector will be available on our website. Its Snap Circuits connections are like this: (+) OUT (–) Motion Detector: (+) - regulated power from batteries (–) - power return to batteries OUT - output connection Lens 9V Holder & SW The 9V battery holder & switch module (only in SCP-03) contains a voltage regulation circuit and on/off switch. It provides a very stable 5V that is needed for modules like the motion detector. Its schematic is looks like this: This

module uses a 9V battery and has an output of 5V, until the battery gets very weak. The volt- age from the battery may vary a little as the circuit current changes, but the 5V output from the mod- ule will not vary nearly as much. This module will not work properly if the circuit current is higher than 500mA. Its Snap Circuits connections are like this: 5V (–) 9V Holder & SW: 5V - regulated 5V outputs (–) - power return to battery Snap for 9V battery ON/OFFswitch 5V
Page 5
R/C Receiver The R/C receiver module (only in SCROV -10 R/C Snap Rover) cont ains a radio receiver circuit, a

specialized radio decoder integrated circuit (W55RFS27R3C or equivalent), and other sup porting component s. It s actual schematic is com plex and looks like this: It s Snap Circuit s connections are like this: Motor Control IC The Motor Control IC module (only in SCROV -10 R/C Snap Rover) cont ains 16 transistors and resistors that are usually needed to control the motors. It s schematic looks like this: This module is needed because the R/C receiver module cannot provide enough power to operate the motors directly . The transistors inside also control the direction the motors spin. It s Snap

Circuit s connections are like this: R/C T ransmitter (–) (+) R/C Receiver: (+) - power from batteries (–) - power return to batteries LBUT - lef t button function (active low) RBUT - right button function (active low) BYP1 - low frequency byp ass BYP2 - high frequency byp ass LF - lef t forward output (active high) LB - lef t backward output (active high) RF - right forward output (active high) RB - right backward output (active high) ABC switch - select s radio channel Motor Control: (+) - power from batteries (–) - power return to batteries LF - lef t forward control input LB - lef t

backward control input RF - right forward control input RB - right backward control input L+ - lef t forward motor drive – - lef t backward motor drive R+ - right forward motor drive R – - right backward motor drive LF BYP1 BYP2 LB RF RB LBUT RBUT (–) (+) L RF RB L+ R R+ LF LB The Remote Control Unit (in all Snap Rover models) cont ains a radio transmitter circuit, a specialized radio encoder integrated circuit (W55RFS27T3B or equivalent), and other supporting component s. It s actual schematic is complex and looks like this:
Page 6
Deluxe Receiver The Deluxe Receiver module (only in

SCROV -50 Deluxe Snap Rover) is a combination of the RX1 R/C Receiver and U8 Motor Control IC modules shown on the preceding p age. These modules were combined in one p ackage to make room on the base grid for for additional modules in Deluxe Snap Rover . The schematic looks like this: It s Snap Circuit s connections are like this: Sound & Recording IC It s Snap Circuit s con nections are like this: Disc Launcher The Disc Launcher unit (only in SCROV -50 Deluxe Snap Snap Rover) cont ains a complex electronic circuit to control when the loading and launching motors st art up and shut down, and

to flash the light s in the “eyes”. It s schematic is shown at lef t. (–) (+) Deluxe Receiver: (+) - power from batteries (–) - power return to batteries LBUT - lef t button function (active low) RBUT - right button function (active low) – - lef t backward motor drive L+ - lef t forward motor drive R – - right backward motor drive R+ - right forward motor drive ABC switch - select s radio channel L (+) (+) L+ R R+ LBUT RBUT (–) (+) 2TC SP PLA 2TT 2T CONT REC TRG Disc Launcher: (+) - power from batteries (–) - power return to batteries CONT - control input (active low) EXT - external device

control (active low) EXT CONT (+) (–) It s Snap Circuit s connections are like this: The Sound & Recording IC module (only in SCROV -50 Deluxe Snap Rover) cont ains an inte grated recording circuit, a dual timer integrated circuit for making audio tones, microphone, speaker , filtering circuitry , and other supporting component s including 24 resistors (2 are adjust able), 13 cap acitors, 3 transistors and 4 diodes. It s schematic looks like this: Sound & Recording IC: (+) - power from batteries (–) - power return to batteries REC - recording control TRG - main tone activation/disable SP -

external speaker control PLA - play recording 2TC - modulating tone control 2TT - modulating tone activation/disable 2T O - modulating tone output CONT - main tone control Knobs: upper controls modulating tone lower controls main tone frequency Red light: this is a recording indicator
Page 7
Color Organ Its Snap Circuits connections are like this: Strobe IC Its Snap Circuits connections are like this: (+) NC OUT (1) CTL Connections: (+)7-7)(.er7fr(m7ba,,erie+ (1)7-7)(.er7re,-rn7,(7ba,,erie+ OUT7-7(-,)-,7c(nnec,i(n7 CTL7-7+,r(be7+)eed7c(n,r(l NC7-7n(,7-+ed (+) FB Connections:

R7-7red7c(l(r7c(n,r(l G7-7 reen7c(l(r7c(n,r(l B7-7bl-e7c(l(r7c(n,r(l (+)7-7)(.er7fr(m7ba,,erie+ INP7-7circ-i,7in)-, FB7-7feedback7c(nnec,i(n (1)7-7)(.er7re,-rn7,(7ba,,erie+ IN7-7a-di(7in)-,7jack OUT7-7a-di(7(-,)-,7jack INP (1) The7 color organ m(d-le7((nly7in7SCL-175)7c(n- ,ain+7re+i+,(r+,7ca)aci,(r+,7,ran+i+,(r+,7a7,ri-c(l(r LED,7 and7 in,e ra,ed7 circ-i,+.7The7 LED7in7 i,7 can chan e7c(l(r+7by7direc,7c(n,r(l,7(r7in7+ynch7.i,h an7 a-di(7 in)-,7 +i nal.7 I,+7 ac,-al7 +chema,ic7 i+ c(m)lex7and7l((k+7like7,hi+: OUT IN The7 strobe IC m(d-le7 ((nly7 in7 SCL-175)7 c(n- ,ain+7 re+i+,(r+,7

ca)aci,(r+,7 and7 ,ran+i+,(r+7 ,ha, are7 needed7 ,(7 make7 a7 +,r(be7 li h,7 circ-i,.7 I,+ +chema,ic7l((k+7like7,hi+: (+) OUT (1) CTL
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tu-)tobat- t -i . Th echoIC (o)lyi)SCS-185)co)tai).- .i.to-., ca+acito-.,a)di)t g-at dci-cuit.thata- ) d d toadd cho ff ct.toa.ou)d.It..ch (aticlook. lik thi.: ItsSnapCircuitsconnectionsarelikethis: