MODPLAY ********* (C) Mark J Cox MODPLAY ** 1990/1991 MODPLAY ******* MODPLAY ************** Amiga four�channel sound module player for PC's Hardware devices for great sound output! I. CONTENTS ��������������������������������������������������������� How to make: Mono output from a parallel port for about 5 pounds Mono output from a parallel port for around 1 pound Stereo from one parallel port for about 12 pounds A +5v power supply A 22W amplifier This document has been supplied with MODPLAY or MODRES and the license agreement attached to the MODPLAY documentation applies to this file. I. INTRODUCTION ��������������������������������������������������������� MODPLAY will play modules through the PC Speaker as mentioned above, via an D to A converter on any of the three possible parallel ports, in stereo if you have an D to A converter on both LPT1 and LPT2 (this sounds really good) and also through a special board that plays stereo from one printer port ("stereo�on�1") 1. HOW TO MAKE A D/A CONVERTER FOR FIVE POUNDS ��������������������������������������������������������� A simple circuit for HiFi quality sound needs only a few components (and this circuit will work with other software). It even sounds better than a Sound Blaster for sampled output! You need: IC1 a ZN426E (about 3 pounds) (Ferranti or Plessey are UK manufacturers) C1 a 10micro-farad electrolytic capacitor (10V or greater) C2 a 4.7micro-farad electrolytic capacitor (10V or greater) R1 a 380ohm resistor (5%, 1/8W) CON1 a phono socket for connecting a lead to your amplifier CON2 a 25 way male D-type connector for your parrallel port A bit of 10 way cable - or 10 short wires. A +5v supply Zn426e +5V D-type pin no \ ��������Ŀ � (2) D0 ��Ĵ9 14��Ĵ (3) D1 ��Ĵ10 � ��� (4) D2 ��Ĵ11 � � � 390� (5) D3 ��Ĵ12 � ��� (6) D4 ��Ĵ13 5��Ĵ (7) D5 ��Ĵ1 6��Ĵ + (8) D6 ��Ĵ2 4��ij�������Ĵ�����> TO AMPLIFIER (9) D7 ��Ĵ3 7 � � 10�F ���������� +� (may not be needed) � 4.7�F� � � (25) GND ������������������������������ GND 2. USING A DIFFERENT DAC ��������������������������������������������������������� Lots of people have found that they cannot get the ZN* chips outside the UK - so heres a circuit that will do the same as above.. Use a DAC0800 or DAC0801 or DAC0803 from National Semiconductors... DAC 080x Parallel Port Pin ��������Ŀ0.01�F 0.1�F (2) D0 ��Ĵ12 16��Ĵ����Ĵ����������� GND (3) D1 ��Ĵ11 � � (4) D2 ��Ĵ10 15������������������5k� (5) D3 ��Ĵ9 � (6) D4 ��Ĵ8 14����������������Ŀ5k� (7) D5 ��Ĵ7 13����������������Ĵ (8) D6 ��Ĵ6 2��Ĵ���������������� +5V (9) D7 ��Ĵ5 3 1 4����������Ĵ�����> TO AMPLIFIER ����������0.1�F + 10�F �Ĵ (may not be needed) � (25) GND ����������������������������� GND The 0.01uF and 2x 0.1uF capacitors are Ceramic. Resistor values not critical 2. GETTING A +5V POWER SUPPLY ��������������������������������������������������������� Catalogues such as MAPLIN (uk) provide simple circuits for obtaining a +5v power supply (it only has to be 100mA maximum). Alternatively you could tap +5v off the keyboard connector or use 3 1.5volt batteries (or even 4 1.5volt batteries with two diodes in series to drop the voltage). In fact, anything that produces a voltage in the range 4.5 � 5.5 volts. (in fact you can even tap +5v from the game port). Don't forget to connect the 0v of your power supply to the GND rail shown. Heres a simple circuit for +5v from mains. Mains voltage is lethal so always get a qualified person to make this if you are unsure. Make certain that the mains voltage is completely isolated from the computer side and that it is impossible to touch - If you don't want to take the risk then don't make this circuit. �����������Ŀ ����Ŀ+ ������Ŀ � � � B �������������������Ĵ 7805 ������������ +5V ������ĴStep down ������Ĵ R � �+ � �������� �+ Mains �transformer� 6V � I � ��� C1 ��� C2 � ��� C3 �to 6VAC � AC � D � � � � � ������Ĵ ������Ĵ G � � � � � � � � E ��������������������������������������� 0V ������������� ������- C1 1000 �F electrolytic capacitor (Circuit from Kenneth C2 0.1 �F ceramic capactitor Aaron, Israel) C3 100 �F electrolytic capacitor BRIDGE any diode bridge 3. HOW TO MAKE AN EVEN CHEAPER D/A ��������������������������������������������������������� For the price of 20 1% resistors and a plug, with no power supply needed you can make a D/A converter that sounds close to the IC one above (it seems only the UK can get a Plessey ZN426E) You need one plug for your amp, one for your parallel port and 9 20k and 9 10K resistors Use 1% resistors if possible � and 20k sound much better than 22k Printer Port: signal pin 20k 20k D0 2 >��İ����İ����0v 20k � 10k D1 3 >��İ��Ĵ 20k � 10k D2 4 >��İ��Ĵ 20k � 10k D3 5 >��İ��Ĵ 20k � 10k D4 6 >��İ��Ĵ 20k � 10k D5 7 >��İ��Ĵ 20k � 10k D6 8 >��İ��Ĵ 20k � 10k D7 9 >��İ��Ĵ 20k � 10k 100nF ������Ĵ�����> TO AMPLIFIER � 10k GND 20 >��������������������> 0v Thanks to Harry Stox for the above circuit. Again, make sure all the 0v lines are connected together. The 100nF capacitor may not be needed, try removing it if this circuit sounds poor. 4. STEREO-ON-1 BOARD ��������������������������������������������������������� It is possible to play in stereo with only one parallel port (MODPLAY version 2.00 onwards) using the circuit below. MODPLAY will automatically detect this circuit if it is present and work out what address it is at � so you can plug it into any of your parallel ports. MODPLAY needs no further options and will default to playing through this device. The +5v supply can be anywhere between 4.5 and 5.5 volts so it could be run from three 1.5v batteries. (Or from four rechargable batteries as these are only 1.2v) * Stereo-on-1 works from MODPLAY 2.03 onwards where it did not in 2.00 * You can use your stereo-on-1 board with other programs that require a single D/A on the port as follows: Find out what address your port is at (LPT1 = 0378, LPT2 = 0278) and add 2 (LPT1 = 037A, LPT2 = 027A). Go into DEBUG and type o 37a,0 (replacing 37a with the port address) q Then all sound directed to the parallel port will come out of both channels. ZN428 ��������������Ŀ 390� �����������������Ĵ11 6��������ı������+5v � ���������������Ĵ12 7��� � � � �������������Ĵ13 3�NC � � � � �����������Ĵ14 � � + 10�F � � � � ���������Ĵ15 5������ij��Ķ������> Left out � � � � � �������Ĵ16 � � 0v���> 20 >�0v � � � � � � �����Ĵ1 10���+5v � � � � � � � � ���Ĵ2 9����0v � 14 >���ijijijijijijijij��Ĵ4 8��� � � � � � � � � � ���������������� � 11 >���Ĵ � � � � � � � ZN428 � + 1�F � � � � � � � � ��������������Ŀ ���Ķ��0v 9 >�����ijijijijijijij��Ĵ11 D7 VRIN 6�������� 8 >�������ijijijijijij��Ĵ12 D6 VROUT 7� NC 7 >���������ijijijijij��Ĵ13 D5 NC 3� NC 6 >�����������ijijijij��Ĵ14 D4 � + 10�F 5 >�������������ijijij��Ĵ15 D3 OUT 5���������Ķ������> Right out 4 >���������������ijij��Ĵ16 D2 � 0v���> 3 >�����������������ij��Ĵ1 D1 +V 10���+5v 2 >���������������������Ĵ2 D0 0v 9���0v 1 >���������������������Ĵ4 !EN 0v 8��� 25 pin male D connector ���������������� Notes: Make sure all the 0v lines are connected together and connected to the 0v line of your power source. Also, make sure the +5v lines are connected together. The lines marked 'NC' do not need to be connected. If a ZN428 is not available, any D/A with input latches will work - the D/A should latch the data bus when pin 4 (!EN) is low. ij� = No connection, ��� = joined The above circuit (Stereo-on-1) is (C) Mark J Cox 1991, 29 Lundie Close Stenson Fields, Derby DE2 3AN; and is supplied for personal use only. For any other use, please contact the author at the address above. If this circuit is abstracted or incorporated into any other document or circuit then that document or documentation supplied with that circuit must contain this paragraph of text. Any commercial use where not agreed by written contract with the author (Mark J Cox) is prohibited. 13. STEREO AMPLIFIER ��������������������������������������������������������� For those of you who have built a stereo DAC and haven't enough inputs to your Amplifier - Kenneth Aaron has supplied this circuit which is designed to give a high power (11W per channel) high quality, low interference, single rail supply amplifier! Enable >����������������������Ŀ ����������������������������� +12v �+ � � � ��� 10�F����������������Ŀ 0v ������� � 7 13 3 1������������� Left Left 470nF ��Ĵ4 2������������� Speaker >�����������������Ĵ � � ��Ĵ5 TDA 7370 14������������� Right Right 470nF ��Ĵ11 15������������� Speaker >�����������������Ĵ � � ��Ĵ12 � +�����Ĵ6 8 9 10��NC 47�F ��� ������������������ � � � ������������������������������������������ 0v Make sure that 0v of the +12v supply is connected to all the 0v connections on the main circuit. The enable line has to be tied to +12v to 'switch on' the amp 14. AUTHOR ��������������������������������������������������������� Before June 1992: ����������������� Mark J Cox Electronic Mail: 17 Kirkburn Place m.j.h.cox@bradford.ac.uk Bradford W. Yorks, UK If that fails - try: BD7 2BZ bc732@cleveland.freenet.edu After June 1992: ����������������� 29 Lundie Close Check the latest version out! Stenson Fields For a Bradford Address.... after Derby, UK June! DE2 3AN