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Ramsey Electronics UT5A Instuction Manual

Universal timer
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Summary of Contents for Ramsey Electronics UT5A

  • Page 4: Theory Of Operation

    THEORY OF OPERATION Theory Intro: The UT5A is made up of many small circuits used to control the 555 timer IC, which is the heart of the kit. First we’ll cover these circuits individually, then we’ll place them into the two most basic modes of operation (monostable and astable) and analyze their operation.
  • Page 5 R4, R5, R6, R7, and C2 make up the RC network responsible for all timing in the UT5A. The component values determine the rate at which the capacitor (C2) charges and discharges. JMP6 controls the way the charging network is connected to the timer IC.
  • Page 6 JMP7 is removed this High (approximately +V) is applied to J5 pin2 as the Inverted Timer Output. If JMP7 is installed this high (approximately +0.7VDC) is applied to the base of Q3. This causes Q3 to turn on pulling, its collector UT5A  6...

  • Page 7: Modes Of Operation

    C2 is also directly connected to pin6 (Threshold) of the timer IC. When C2 is charging the Monostable is in its Unstable state. C2 is allowed to charge when U1 pin3 (Output) is High and pin7 (Discharge) is providing an UT5A  7...
  • Page 8 (Out) to go High and Discharge (pin7) removes ground. C2 is now allowed to charge through R7, R6, R5, R4, to VCC. When C2’s charge reaches Threshold level (2/3 VCC or Control Voltage if used) U1 pin6 (Threshold) ends UT5A  8...
  • Page 9 0.693 * C2 * [(R4 + R5) + 2(R6 + R7)] Duty cycle is the ratio of Pulse Width to Total Cycle time, it can be calculated R4 + R5 + R6 + R7 DC = R4 + R5 + 2(R6 + R7) * 100% UT5A  9...
  • Page 10 UT5A PARTS LAYOUT DIAGRAM UT5A  10...
  • Page 11 UT5A PARTS LIST Semiconductors 1 555 Timer IC (marked 555) U1) 2 1N4002 (marked 1N4002) (D3,4) 2 1N4148 (marked 1N4148) (D1,2) 3 2N3904 NPN General Purpose transistors (marked 2N3904) (Q1,2,3) Resistors 4 1k ohm resistors (marked brown-black-red) (R2,5,7,9) 5 10k ohm resistors (marked brown-black-orange) (R1,3,10,11,12) 2 47k ohm resistors (marked Yellow-violet-orange) (R5A,7A)
  • Page 14 20. Install S1, a SPST Push Button switch. This part will fit in the board in two different directions, either one will work. 21. Install S2, an other SPST Push Button switch. 22. Install JMP2, a 2 pin header. 23. Install JMP3, another2 pin header. 24. Install JMP4, another2 pin header. UT5A  16...
  • Page 15 A this point you will need to figure out what part values you need to install for your first application. See the the- ory of operation section for calculations or the charts that follow at the end of this section for a component values. UT5A  17...
  • Page 16 41. Install C2, using the calculations or charts select your part value. If you select the 0.1uF capacitor (marked 104) polarity is no concern. If you select the 10uF (marked 10uF) or the 1000uF (marked 1000uF) electro- lytic capacitor observe correct polarity. UT5A  18...
  • Page 17 FREQ 0.1 uF R5/7 = 47k R4/6 = 97k R4/6 = 547k 6.5 mS 13.4 mS 75.8 mS 3.3 mS 6.7 mS 37.9 mS 9.8 mS 20.2 mS 113.7 mS 102.3 Hz 49.6 Hz 8.8 Hz FREQ UT5A  19...
  • Page 18 FREQ 10 uF R5/7 = 82k R4/6 = 132k R4/6 = 582k 1.1 S 1.8 S 8.1 S 568.2 mS 914.8 mS 4.0 S 1.7 S 2.7 S 12.1 S 587.0 mHz 364.4 mS 83 Hz FREQ UT5A  20...
  • Page 19 PW 1386.0 S / 23.1 M 1455.3 S / 24.3 M 2079.0 S / 34.7 M RT 693.0 S / 11.6 M 727.7 S / 12.1 M 1039.5 S / 17.3 M TT 2079 S / 34.7 M 2183.0 S / 36.4 M 3118.5 S / 52. M UT5A  21...
  • Page 20 3. Verify that R4, R5, R6, R7 and C2 are the proper values to give the timing you require for both Pulse Width and Rest Time. Control Voltage Configuration: 1. For no Control Voltage remove the Shorting Block from JMP5 and leave J3 pin 1 open. UT5A  22...
  • Page 21 Timer Power install a Shorting Block across the pins of JMP1. If you are going to use a separate supply remove the Shorting Block at JMP1. Connect your separate supplies positive lead to J1 pin 3 and the negative lead to J1 pin 2. UT5A  23...

  • Page 22: Troubleshooting

    Verify JMP4 is installed for Monostable mode Insure proper input is used for Monostable mode Insure JMP2 is installed for Monostable mode if required Insure good ground connections between source and timer FAULT: Inverted output is only 1 Volt. SOLUTIONS: Remove JMP7 UT5A  24...
  • Page 23 Repair of Assembled Kits” section of our Ramsey Kit Warranty page on the inside back cover of this manual. You may also contact our Technical Support Department at : Phone: (585) 924-4560 Email: techsupport@ramseyelectronics.com Address: Ramsey Electronics, LLC Attn. Hobby Kit Department 590 Fishers Station Drive Victor, NY 14564 UT5A  25...
  • Page 24 Please submit comments or ideas to: Ramsey Electronics, LLC Attn. Hobby Kit Department 590 Fishers Station Drive Victor, NY 14564 or email us at: techsupport@ramseyelectronics.com And once again, thanks from the folks at Ramsey! UT5A  26...
  • Page 25 “1K ohm” resistors are actually the “missing” 10 K parts ("Hum-m-m, I guess the orange band really does look red!") Ramsey Electronics project kits are packed with pride in the USA by our own staff personnel.