• Easy choice of Timer or Oscillator operation. • Makes ideal code practice oscillator. • Timer can be triggered by positive or negative pulses. • Runs on 5 - 15 VDC, drives up to 100 mA. loads. UNIVERSAL TIMER OSCILLATOR Solve all your timing needs easily and inexpensively. Timing from microseconds to hours, oscillation from sub-audible to 100 KHz. Easy to use and apply kit features the popular 555 IC Timer chip with fully detailed instruction manual and hook-ups! UT5 - 1 Kit No.
INTRODUCTION: The purpose of the UT5 kit is to make the popular and versatile NE555 timer IC as convenient and understandable to use as possible. Hundreds of 555 circuit ideas are around, but they all have one common need: a well-organized circuit board for taking advantage of this economical IC's capabilities.
THE 555 IC ITSELF: The "555 timer chip," as it's popularly known among electronics hobbyists, packs over 40 parts, including 23 transistors, into its 8-pin package. It may be operated in either of two "modes" and the UT5 PC board is designed to permit easy set-up of either mode: Mono-Stable ("one shot") Mode: In this mode, the 555 awaits a command pulse to start a timing cycle which may be any length you choose from miiliseconds to hours, depending on the value calculated for C1 and the setting of R3.
UT5: PARTS SUPPLIED WITH KIT: A. PARTS COMMON TO ALL CIRCUIT APPLICATIONS: 2 .01 uf disc capacitor (marked .01 or 103 or 10nf) (C2,C3) 2 1K ohm resistor [brown-black-red] (R4,R5) 2 10K ohm resistor [brown-black-orange] (R1,R2) 1 100K to 250K ohm potentiometer (R3) [style may vary] 1 NPN transistor (Q1) [2N3904 or equivalent] 1 NE555 IC (U1) or equivalent [such as MC1455] B. PARTS SUPPLIED FOR BASIC APPLICATIONS: 1 1 uf electrolytic capacitor (C1-A) 1 33 uf electrolytic capacitor (C1-B) 1 .
UT5 PARTS LAYOUT: UT5 - 5
Phase 1: BASIC PC BOARD ASSEMBLY: 1. Install 10K resistor R1 [brown-black-orange]. 2. Install 10K resistor R2 [brown-black-orange]. 3. Install 1K resistor R4 [brown-black-red]. 4. Install 1K resistor R5 [brown-black-red]. 5. The 555 IC may be soldered directly to the PC board without worry, but you may use a 8-pin DIP socket (your own) if you prefer. Use the same care in soldering such a socket and inserting the IC as you would in direct soldering of the chip.
12. Now, choose monostable (timer) mode or astable (oscillator) for your first project or test. Simply install a jumper wire and/or R6 (1K: brown-black-red) as follows: MONOSTABLE MODE: (install Jumper 1 only). ASTABLE MODE: (R6 as J1 and J2 both installed). 13. After studying the application ideas in this booklet, install your choice for C1. If you use an electrolytic capacitor,observe correct polarity. If you use a disc capacitor such as a .
Phase 3: PUTTING THE UT5 TO WORK: Now, use some hookup wire, speaker wire, etc.
UNDERSTANDING THE PULSE INPUTS: In this instance, a "pulse" is a millisecond application of either a positive or negative voltage from a digital output device, or just the simple punching of a momentary button switch. The choice of positive or negative pulse inputs is provided for your convenience. If you want to start the timing with a push button or microswitch, simply connect the switch to points C and D.
Consequently, it is wise to consult an electronics parts catalog or store for available capacitor values and do your circuit designing around values that actually exist, whether a single capacitor or a capacitance created by series or parallel combinations. PLANNING THE TIMING BY FORMULA: The timing can be calculated exactly by this formula: TIME (in seconds) = 1.1 (C1 in farads) X R3 (in ohms) and may also be expressed and worked in these ways: TIME = 1.1 X C1 (in uf) X .000001 X R3 in ohms TIME = 1.
210 INPUT "R3 in OHMS = "; R 220 PRINT "Required capacitance in ufd. = "; T/(1.1*.000001*C) 230 PRINT 240 GOTO 10 300 INPUT "Desired TIME in seconds = "; T 310 INPUT "Value of C1 in microfarads = "; C 320 PRINT "Required value of R3 in ohms = "; T/(1.1*.000001*C) 330 PRINT 340 GOTO 10 Similarly, the oscillator frequency in astable mode can be found by formula, also worked easily as a Basic computer program: Frequency (Hz) = 1.
500 GOTO 410 510 INPUT "Desired FREQUENCY in Hz> =";F 520 INPUT "R3 in OHMS =";R 530 PRINT "Required capacitance in uf =";1.44/((R+2000)*F)*.000001 540 PRINT 550 GO TO 410 560 INPUT "Desired FREQUENCY in Hz. =";F 570 INPUT "Value of C1 in microfarads =";C 580 PRINT "Required value of R3 in ohms ="; 1.44/(C*.000001*F)-2000 590 PRINT 600 GOTO 410 610 REM 2000 IS 2*4 AND SHOULD BE ADJUSTED IF R4 IS CHANGED SAMPLE PROJECTS - OSCILLATOR MODE: These project ideas are models or samples.
Connect speaker & volume control as shown: KE Y F +5 - 1 5 V TONE (P ITCH) E R 6 J2 R3 A 4 .7 t o 1 0 uF + 2. GENERAL PURPOSE TEST OSCILLATOR (200 to 20,000 + Hz.) Same as above, plus: Add switches and capacitors as desired for maximum range and conveniences. 3. PRACTICE METRONOME Same as No. 1, but try C1 at 47 uf. If desired, add an LED and 1K resistor in series across the speaker capacitor. 4.
SAMPLE PROJECT - MONOSTABLE MODE: In this era of digital clocks, commercially-available timing gadgets can be either amazingly cheap - or oppressively costly. In general, we build timers ourselves instead of buying them only if a reasonably priced commercial device just will not do the job that we want done. Most timers that are accurate to the millisecond do not have the ability to switch an external device. Most applications for custom designed timers are one-of-a-kind requirements.
R3 +DC DC on/off F 2 3 4 5 1 C1+ 10 J1 RELAY (coil under 100mA) SECONDS E D C START A UT-5 4148 B RESET THE "ULTIMATE" UT5 PROJECT: The 555 IC is so useful and the UT5 PC board connection and jumper points are so convenient, that you might like to design your own "universal 555 test box" with monostable-astable switching, choice of internal or external DC supply, choice of panel button or external positive/negative pulses, choice of built-in speaker or external output device, etc. etc.
CONCLUSION: There's no easier way to create customized timer or oscillator projects than knowledgeable using of the UT5. This very convenient module will make short work of many of those little projects that all of us have "always wanted to do.
The Ramsey Kit Warranty Please read carefully BEFORE calling or writing in about your kit. Most problems can be solved without contacting the factory. All Ramsey kits will work if assembled properly. The very fact that your kit includes this new manual is your assurance that a team of knowledgeable people have field-tested several "copies" of this kit straight from the Ramsey Inventory.
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