ࡱ> Z\Yo@ \bjbj p p /oo&5zzzzzzz( ( ( 8` | $2 ( *,,,,,,$R/Pz g "  Pzz e z z * *j:b,zz >q( ^ ,{0 4"zzzzz\   S PPD( ( Electronics Disco Lights As we have seen, the OpAmp can be used as both an amplifier and a comparator. We combine these two blocks along with an electret microphone input block and a transistor driver block to form a sound operated light circuit. With a low-pass filter block and the amplifier turned into an active low-pass filter, the circuit should pick out the base beat of the music. The lights will then flash in synchronism with the music. We could also add to the circuit using a relay or opto-isolator/triac combination to power low voltage ac lamps such as halogen lights.  The picture above shows an Xray view of the printed circuit board (pcb) and shows where each component needs to fit. Many of the components need to be fitted one way round so you need to be careful in your soldering. The circuit has been developed from the Crocodile Technology block circuit and tested in simulation and using ready built modules. One modification had to be made extra decoupling around the microphone was needed to stop oscillation. Collect and identify the components Write down the colour codes for the resistor values below. 47R = 1k = 10k = 18k = 22k = 47k = 1M = 10M = You will need the following components: 12 x resistors 3x47R, 1x1k, 3x10k, 1x18k, 1x22k, 1x47k, 1x1M, 1x10M. 2 x 1N4148 diode (small orange glass) 2 x 8 pin chip sockets 1 x Battery clip 1 x electret microphone 1 x 220nF block capacitor reading u22 12 x assorted Light Emitting Diodes (LEDs) 1 x 50k and 1 x 1M preset resistor 1 x BS170 transistor 3 x 1uF, and 2 x 470uF electrolytic capacitors 2 x 741 OpAmp chip (integrated circuit) Assembly plan Clean board with scourer to get rid of fragments of copper, traces of grease and tarnish and check carefully for any short-circuits. Solder in the resistors (3x47R, 1k, 3x10k, 18k, 22k, 47k, 1M, 10M). Use the resistor colour code and the table above to make sure you correctly identify them. Solder in the diodes with the black band at the top. Solder in the 8 pin sockets (notch to the left). Fit the battery clip feeding the wires through the large holes from the top then up again and finally bend them round and push the red wire through the top hole and the black wire through the bottom hole. Solder and pull tight. Solder in the microphone, case connector to the bottom. Solder in the blue block capacitor, the 220nF is marked u22. Solder the LEDs 3 at a time be sure to get them at the same height and the right way round flat side or short leg towards the bottom of the board. Solder in the two 50k preset resistors. Solder in BS170 field effect transistor (flat side to the left). Solder in the four electrolytic capacitors the long leg is positive and should go to the top or left.. Checking the pcb Check the circuit very carefully to make sure no solder crosses tracks. Check all the components against the layout drawing. Correct value resistors; diodes, electrolytic capacitors and LEDs the right way round; transistor and right way round. Half connect a battery and with a meter set on Amps, check that you have only a small current flowing. Check that the BS170 FET is not getting hot. Connect the battery fully and use the meter to check that you have zero volts on pin 4 and 9v on pin 7 of the chip sockets. Disconnect the battery and push the 741 integrated circuits into the chip sockets carefully, making sure the notch is at the left and that you dont bend the legs. Connect the battery again and make sure the chips do not get hot. Adjusting the controls Turn the left-hand preset resistor to its half-way point. Now turn the right hand potentiometer fully clockwise. The LEDs should be off. Now turn it fully anti-clockwise and the LEDs should be fully on. Adjust the potentiometer until until the LEDs are just off. Turn the left-hand pot until gently stroking the microphone or tapping the desk turns the LEDs on. Finally, test the circuit to see if the LEDs come on in response to a bass beat or loud noise. If it doesnt work! Remove the battery immediately. Make sure youve fitted the chips and the transistor the correct way round. Check that the LEDs are the right way round - the flat section of the rim of an LED goes to negative (bottom of this circuit). If those are ok then it is most likely a problem with the soldering check it again very carefully.  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