Correction and Updates Details

SC300 - Electronic Snap Circuits®

Experiments 102-305 manual:

The manual revision is indicated on the bottom right of the cover.

Rev F:

Screw-in bulb/socket may have been replaced with a single-piece lamp.
Page 2 – The symbol for C3 is missing.
Page 5, step 13 – The drawing is wrong. Either connect the branch with R4 to the D2 side of Q1, or just use project 128 to test the PNP transistor (Q1).
Page 5, step 14 – use the 100???? resistor R1, not 1K???? R2.
Project 103 – Add a 1-snap at base grid location C6, on level 1.
Project 104 – The references to space war sounds in the text and objective are misleading; it doesn’t really sound like that.
Project 123 – This circuit might not make noise if you have too little or too much moisture on your fingers.
Project 220 – The circuit drawing uses ten 2-snaps, but model SC-300 only includes nine. Remove L2 and instead place L1 across base grid locations D7-D9 on level 3.
Project 221 – Remove 2nd paragraph.
Project 228 – Change “here a tone” to “hear a tone”.
Project 230 – This project doesn’t always work. Use the whistle chip (WC) instead of the variable capacitor (CV).
Project 248 – Replace L1 with L2. Change objective text to “To make space battle sounds.”
Project 262 – Swap L1 with one of the 3-snaps, replace the other 3-snap with L2, and remove the last 2 sentences of text.
Project 265 – The drawing should show the 3-snap as being above the R5 resistor, not below it.
Project 296 – Our C5 parts are now non-polarized, so this circuit won’t work. Use this circuit instead:

Rev E:

Project 111 – R4 is being replaced, not R5.
Project 112 – R4 is being replaced, not R5.
Project 123 – The resistor at left is R3.
Project 180 – Place the fan on the motor.
Project 182 – Replace the 100Ω resistor (R1), not the 3-snap wire.
Project 219 – The objective and second sentence should refer to the speaker making sound, not the LED flashing.
Project 253 – The text should refer to lamp L1, not L2.
Project 263 – Flip C4 for best performance.
Project 281 – Flip C4 for best performance.

Rev D:

Project 109 – The text should refer to lamp L2, not L1.
Project 123 – Add a 2-snap across base grid locations E5-E6.
Project 139 – In the drawing, R1 should be R3.
Project 174 – This is the same circuit as project 102. See Rev-F for revised circuit.
Project 199 – This circuit does not always work, change D2 to C3 (+ on left) to fix.
Project 215 – The unmarked resistor on the left is R5.
Project 219 – This circuit does not always work. See Rev-F for revised circuit.
Project 253 – Add a 1-snap at base grid location E4.
Project 265 – This circuit does not always work. See Rev-F for revised circuit.
Project 277 – This circuit does not always work. See Rev-F for revised circuit.
Project 279 – Add a 1-snap at base grid location C3, level 2.
Project 280 – The 4-snap is on level 2, not level 1.
Project 288 – See Rev -F for an improved circuit, with better sound quality.
Project 296 – The resistor on level 2 is the 1KΩ (R2).

Rev C:

The project listing on page 7 incorrectly refers to project 233 as Electronic Golf Game, it should say Mind Reading Game.
Project 102 – Text line 2 should say 100, not 1K.
Project 104 – 2-snaps at F1-F2 and F2-F3 should say level 1 and level 3, respectively.
Project 134 – The circuit drawing is incorrect, replace variable resistor RV with PNP transistor Q1.
Project 151 – Three 2-snaps have the level marked incorrectly: D7-E7 should be on level 2, E7-F7 should be on level 3, and F7-F8 should be on level 2.
Project 158 – This project calls for five 3-snaps when only four are available, so replace the 3-snap across base grid locations G7-G9 with a 4-snap across G6-G9.
Project 164 – Change first line of 2nd paragraph to say: “Now turn off the slide switch. Repeat the test with the slide switch off; you’ll notice the LED goes out much faster after you release the press switch.”
Project 165 – In the second paragraph, (C4) should be (C5).
Project 177 – Second sentence should say: “Blowing hard into the microphone turns off the light briefly.”
Project 178 – Resistor R5 is on level 3, not level 2.
Project 180 – Capacitor C2 cannot be placed next to the speaker as shown. Remove the 1-snap from the speaker to correct this; C2 can be mounted between levels 3 and 4 on this circuit.
Project 185 – Part of the 3rd sentence should say: “appears to be on”, not “appears be on”.
Project 188 – Change “(C3, in either orientation)” to “(C3, plus side on right)”.
Project 197 – There should be a 2-snap connecting transistors Q1 and Q2.
Project 198 – Make these changes to improve performance: replace R5 with RV, remove 1-snap and 3-snap at A3-A5 and place jumper wires at these points, place 3-snap at E1-E3.
Projects 217 and 219 – The resistor cannot fit onto speaker as shown. Shift the resistor to level 2 and the 2-snap across grid locations D3-D4 to level 3, move the 1-snap to D3.
Project 225 – Text should say “Q2”, not “U2”.
Project 226 – Change “get” to “got” in line 3, and change “press press” to “press the press” in line 6.
Project 230 – “C5” should be “CV”.
Project 232 – The text should say: “Use the circuit from project 228 shown above, but change the 1KΩ resistor (R2) to the 100Ω resistor (R1). While holding down the press switch (S2), move the slider on the adjustable resistor (RV) around. When the slider is near the 100Ω resistor you won’t hear any sound, but the circuit is still working. This oscillator circuit is making sound waves at a frequency too high for your ears to hear. But your dog may hear it, because dogs can hear higher frequencies than people can.”
Project 245 – Change 4th sentence to say: “Any loud sound or vibration causes the whistle chip to produce a small voltage, which activates the circuit.
Project 253 – There should be a 1-snap at base grid location E4, on level 1.
Project 262 – Flip the motor around, so the “+” side is down.
Project 276 – The drawing shows the wrong circuit, and is corrected in Rev D.
Project 278 – The 4-snap on the left is on level 2, not 3.
Project 279 – The speaker is on level 3, not 2.
Project 284 – Once activated, the sound stays on until you turn off the switch.
Project 300 – There should be a 1-snap at G7.


Manual PDF (Click to download):   SC-300_REV-H3.pdf


The Learning Center

Want to learn even more.  Try our educational versions of your favorite Snap Circuits®.  All you need are the stud