Wiki

Differences

This shows you the differences between two versions of the page.

Link to this comparison view

Both sides previous revision Previous revision
Next revision
Previous revision
university:courses:electronics:electronics-lab-breadboards [04 May 2014 02:05]
Doug Mercer [Using breadboards with the Analog Discovery Module:]
university:courses:electronics:electronics-lab-breadboards [18 Apr 2019 21:14]
Doug Mercer [Breadboarding tips:]
Line 38: Line 38:
 3. Arrange the jumper wires to lay flat on the board, so that the board does not become cluttered.\\ 3. Arrange the jumper wires to lay flat on the board, so that the board does not become cluttered.\\
 4. Route jumper wires around the integrated circuits and not over the packages. This makes changing the chips easier as needed.\\ 4. Route jumper wires around the integrated circuits and not over the packages. This makes changing the chips easier as needed.\\
-5. Trimming the leads of components like resistors, capacitors, transistors and LEDs, so that they fit closely to the board and do not get pulled out by accident is a good practice.\\+5. Trimming the leads of components like resistors, capacitors, transistors and LEDs, so that they fit closely to the board and do not get pulled out by accident is a good practice. While short wires and leads look neater, the clipped components will only fit into a limited “span” of breadboard socket holes, limiting the use 
 +of the component in other experiments. It is perfectly permissible to use components with longer leads while exploring different circuit possibilities.\\
  
-===== Using breadboards with the Analog Discovery Module: =====+Be cautious when inserting components which have been removed from a tape reel used in automatic insertion equipment. Suppliers of surplus components often sell components in small batches cut from larger taped reels. Removing ​the tape from the components does not always remove the all the adhesive from the leads of the components. Placing a formerly taped component into a socket hole may result in a poor electrical connection and, even worse, may leave adhesive residue in the socket. To avoid this problem carefully clean the adhesive residue from component leads, clipping the taped portion of the lead off, or avoid using components that have been taped.
  
-All the connections ​to the Analog Discovery design kit are made though ​the 30 pin male header (0.1" centers) connector on the side of the moduleThis is a very commongeneric style connector and is simple ​to attach wires to as with the various female to female cables supplied ​in the kit. Double length square male pins are included to change the female ​end of the wires into male pins that can be easily inserted into the solder-less breadboards used in the lab for building example ​circuits. ​These fly-wires ​are several inches long and can be awkward to use at times given the relatively light weight ​of the Discovery box and a small solder-less breadboard.+It is important ​to be especially careful when inserting integrated circuits into the breadboard holes. Unless the IC pins are straight, it is very easy to crush the pin into a zigzag shape or fold the pins underneath the body of the ICEither way the result ​is a bad connection or no connection at all. 
 +Always use solid wire for breadboard connections. When stripping the wire endsbe careful not to strip more than about three-eighths of an inch of insulation from the wire. Too much bare wire may result ​in unintentional connections near the wire end. After you have built up a few circuits, you will have a good collection ​of pre-stripped jumper ​wires. Save them. By reusing these wires, you can save even more time and effort ​in assembling future ​circuits. ​Pre-formed ​wires of various lengths ​and colors are also available from many sources.
  
-Adapters such as those shown below are workable alternatives. They adapt the square male pins of the Discovery ​connector to two rows of male pins on 300 mil spacing (like DIP packages) that will plug nicely into a solder-less breadboard.+ 
 +===== Using breadboards with the ADALM2000 Module: ===== 
 + 
 +All the connections to the ADALM2000 design kit are made though the 30 pin male header (0.1" centers) connector on the side of the module. This is a very common, generic style connector and is simple to attach wires to as with the various female to female cables supplied in the kit. Double length square male pins are included to change the female end of the wires into male pins that can be easily inserted into the solder-less breadboards used in the lab for building example circuits. These fly-wires are several inches long and can be awkward to use at times given the relatively light weight of the ADALM2000 box and a small solder-less breadboard. 
 + 
 +Adapters such as those shown below are workable alternatives. They adapt the square male pins of the ADALM2000 ​connector to two rows of male pins on 300 mil spacing (like DIP packages) that will plug nicely into a solder-less breadboard.
  
 {{:​university:​courses:​electronics:​dual_row_receptical-10.jpg?​300 |}} {{ :​university:​courses:​electronics:​dual_row_receptical-14.jpg?​300}} {{ :​university:​courses:​electronics:​dual_row_receptical-20.jpg?​300 |}} {{:​university:​courses:​electronics:​dual_row_receptical-10.jpg?​300 |}} {{ :​university:​courses:​electronics:​dual_row_receptical-14.jpg?​300}} {{ :​university:​courses:​electronics:​dual_row_receptical-20.jpg?​300 |}}
Line 52: Line 59:
 A 12 pin (dual row of six) version is also available from:​[[http://​www.digilentinc.com/​Products/​Detail.cfm?​NavPath=2,​401,​1081&​Prod=PMOD-DIP|Digilent PmodDIP]] A 12 pin (dual row of six) version is also available from:​[[http://​www.digilentinc.com/​Products/​Detail.cfm?​NavPath=2,​401,​1081&​Prod=PMOD-DIP|Digilent PmodDIP]]
  
-The smaller adapters can be used individually or combined to fill out the entire 30 pins of the Discovery ​connector, 10+20 or 14+16.+The smaller adapters can be used individually or combined to fill out the entire 30 pins of the ADALM2000 ​connector, 10+20 or 14+16.
  
-Another more convenient arrangement would be an adapter PC board that connects to the 30 pin male header of Discovery ​and brings all the connections to a female header positioned right alongside the breadboard area. By using a female header simple 22 gage solid wire jumpers can be used to connect to the breadboard rather than the long female to female fly-wires supplied with the kit. An example 3.1" by 3.4" adapter PC board layout is shown in figure 4.+Another more convenient arrangement would be an adapter PC board that connects to the 30 pin male header of ADALM2000 ​and brings all the connections to a female header positioned right alongside the breadboard area. By using a female header simple 22 gage solid wire jumpers can be used to connect to the breadboard rather than the long female to female fly-wires supplied with the kit. An example 3.1" by 3.4" adapter PC board layout is shown in figure 4.
  
 {{ :​university:​courses:​electronics:​abb_f4.jpg?​350 |}} {{ :​university:​courses:​electronics:​abb_f4.jpg?​350 |}}
Line 60: Line 67:
 <WRAP centeralign>​ Figure 4 Breadboard adapter layout </​WRAP>​ <WRAP centeralign>​ Figure 4 Breadboard adapter layout </​WRAP>​
  
-The board consists of a grid of 21 by 30 plated through holes on 0.1" centers which can be used to solder test circuits. Three of the columns of holes on the left side of the grid are shorted together and tied to the +5V, -5V and ground connections on the 30 pin right angle female connector that mates with Discovery. Three of the columns of holes on the right side of the grid are shorted together and tied to the +9V, -9V and ground connections for use with external batteries or other sources of power. The 30 Discovery ​connections are brought to a breakout space for a 40 pin vertical female header positioned alongside the breadboard area.+The board consists of a grid of 21 by 30 plated through holes on 0.1" centers which can be used to solder test circuits. Three of the columns of holes on the left side of the grid are shorted together and tied to the +5V, -5V and ground connections on the 30 pin right angle female connector that mates with ADALM2000. Three of the columns of holes on the right side of the grid are shorted together and tied to the +9V, -9V and ground connections for use with external batteries or other sources of power. The 30 ADALM2000 ​connections are brought to a breakout space for a 40 pin vertical female header positioned alongside the breadboard area.
 The 21 X 30 grid is sized to accommodate the popular 30 position (400 total connection points) solder-less breadboards with power busses along both sides which are 2 1/8" by 3 1/4". These breadboards come with adhesive backs that will stick the breadboard to the adapter PC board. The 21 X 30 grid is sized to accommodate the popular 30 position (400 total connection points) solder-less breadboards with power busses along both sides which are 2 1/8" by 3 1/4". These breadboards come with adhesive backs that will stick the breadboard to the adapter PC board.
-The schematic of the adapter board is shown in figure 5. The signals and power supplies that Analog Discovery ​can generate are limited by the USB power available from the computer. The analog inputs can measure much larger +/- 20 volt signals. This board provides a place to connect external power sources such as a pair of 9 V batteries. A socket for a dual op-amp is included with the two amplifiers configured as non-inverting gain stages and are powered from the external power supplies. A pair of resistors for each amplifier sets the gain. Depending on the choice of amplifier it can be used, for example, to boost the voltage and/or current available from the AWGs or for other purposes in the circuit being breadboarded. The external power supplies along with the inputs and outputs of the two amplifiers fill out the extra 10 pins on the 40 pin header.+The schematic of the adapter board is shown in figure 5. The signals and power supplies that ADALM2000 ​can generate are limited by the USB power available from the computer. The analog inputs can measure much larger +/- 20 volt signals. This board provides a place to connect external power sources such as a pair of 9 V batteries. A socket for a dual op-amp is included with the two amplifiers configured as non-inverting gain stages and are powered from the external power supplies. A pair of resistors for each amplifier sets the gain. Depending on the choice of amplifier it can be used, for example, to boost the voltage and/or current available from the AWGs or for other purposes in the circuit being breadboarded. The external power supplies along with the inputs and outputs of the two amplifiers fill out the extra 10 pins on the 40 pin header.
  
 {{ :​university:​courses:​electronics:​abb_f5.jpg?​450 |}} {{ :​university:​courses:​electronics:​abb_f5.jpg?​450 |}}
Line 68: Line 75:
 <WRAP centeralign>​ Figure 5 Breadboard adapter schematic </​WRAP>​ <WRAP centeralign>​ Figure 5 Breadboard adapter schematic </​WRAP>​
  
-The layout of the resistors around the dual op-amp are arranged such that rather than two independent amplifiers, a single resistor can be inserted between the two inverting inputs, in place of the two resistors (R1,R4) to ground. Configured this way the two op-amps form the input section of an instrumentation amplifier. The amplified differential signal at the outputs of the two amplifiers can then be connected to the differential scope inputs on Discovery. Another possible use would be to generate complementary or differential signals from one of the AWGs. By connecting one input to ground, with the other input connected to one of the AWG outputs and adjusting the resistor values the first amplifier acts as a non-inverting stage to generate the in phase or true output and the other amplifier acts as an inverting stage to generate the 180º phase or complement output. To make it easy to swap resistor values individual pin sockets could be installed rather than directly soldering the resistors to the board. Likewise using a socket for the op-amp would allow you to interchange different devices optimized for the intended application. +The layout of the resistors around the dual op-amp are arranged such that rather than two independent amplifiers, a single resistor can be inserted between the two inverting inputs, in place of the two resistors (R1,R4) to ground. Configured this way the two op-amps form the input section of an instrumentation amplifier. The amplified differential signal at the outputs of the two amplifiers can then be connected to the differential scope inputs on ADALM2000. Another possible use would be to generate complementary or differential signals from one of the AWGs. By connecting one input to ground, with the other input connected to one of the AWG outputs and adjusting the resistor values the first amplifier acts as a non-inverting stage to generate the in phase or true output and the other amplifier acts as an inverting stage to generate the 180º phase or complement output. To make it easy to swap resistor values individual pin sockets could be installed rather than directly soldering the resistors to the board. Likewise using a socket for the op-amp would allow you to interchange different devices optimized for the intended application. 
-The Discovery ​hardware itself is rather small and light weight and special care should be taken when using an adapter like this. It might be useful to add small stick on rubber feet to the underside of the adapter board to help prevent it from tipping or sliding around on the work surface.+The ADALM2000 ​hardware itself is rather small and light weight and special care should be taken when using an adapter like this. It might be useful to add small stick on rubber feet to the underside of the adapter board to help prevent it from tipping or sliding around on the work surface.
  
 Eagle CAD schematic and PCB layout files can be down loaded here {{:​university:​courses:​electronics:​ad_breadboard.zip|}}. Eagle CAD schematic and PCB layout files can be down loaded here {{:​university:​courses:​electronics:​ad_breadboard.zip|}}.
university/courses/electronics/electronics-lab-breadboards.txt · Last modified: 18 Apr 2019 21:14 by Doug Mercer