What does the dot on the schematic symbol for an IC socket holder printed on a circuitboard?
Some ICs have indented notches on one side; simply line this up with the notch in the printed outline on the circuit board. Other chips use a “dot” at one corner of the chip to mark the location of pin 1.
How many pins an IC can have?
The pins are numbered anti-clockwise around the IC (chip) starting near the notch or dot. The diagrams show the numbering for 8-pin and 14-pin ICs, but the principle is the same for all sizes.
Which IC chips contain gold?
List of Ceramic CPU’s that have the Highest Gold Content
- Intel 186 / 286 / 386 / 486 / Pentium / Pentium Pro / i860 / i960.
- Cyrix 486 / 586 / MII.
- IBM 486 / 586 / 686.
- Motorola 68000 / 88000 series.
- NEC & Toshiba MIPS series: R4000 / R8000 / R10000 / R12000.
- AMD 286 / 386 / 486 / K5 / 29000 series.
- IDT Winchip C6 / 2A.
What is the difference between single line diagram and schematic diagram?
Single-line diagrams are where upper-level details like generators, main transformers, and large motors are shown. Schematic diagrams show the functionality of more mid-level electrical circuits without getting bogged down in the details of individual connections (which are shown on wiring diagrams).
Can a 555 timer be used in a special circuit?
Using The “555” Timer IC In ‘Special’ Or Unusual Circuits. The ‘555’ timer is a popular bipolar IC that is specifically designed to generate accurate and stable C-R — defined timing periods, for use in various monostable ‘one-shot’ pulse generator and astable squarewave generator applications.
How can a 555 timer be damaged [ video ]?
A supply voltage that is too high will destroy all ICs. If an IC drives an inductor then the IC is destroyed by the very high flyback voltage produced when it turns off power to the inductor. If you short the output of a 555 then its very high output current will fry it.
How is the 555 used in a schmitt trigger?
The 555 can be used as a Schmitt trigger by shorting pins 2 (trigger) and 6 (threshold) together and applying the input signals directly to these points, as shown in the functional diagram and circuit in Figure 1. FIGURE 1.
How is a potential divider used on a 555?
Potential divider R1-R2 biases pins 2 and 6 to a quiescent value of 1/2 V cc (i.e., mid-way between the upper and lower trigger values), and the sinewave input is superimposed on this point via C1; squarewave outputs are taken from pin 3. R3 isolates the input signal from the effects of the 555’s switching actions.