IC746
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Simple Quiz Display
A simple quiz display is constructed using two TTL ICs: the 7445 and the 7420. It indicates which switch is pressed first, accompanied by a circuit diagram. This project represents an interesting and verified game concept.
The circuit utilizes the TTL...
Electronics Projects Circuits
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ttl three state logic probe circuit
The circuit presented utilizes NAND logic gates from the Hitachi HD series, specifically the HD74LS00, which is a quad NAND integrated circuit. A special technique has been implemented to achieve three-state operation using a single IC. Gate N1 is configured...
Sine- And Square-Wave Ttl Oscillator
A TTL oscillator utilizing a Quad NAND Gate can operate with fundamental crystals ranging from 1 to 10 MHz. The sine wave output is derived directly from the crystal, which functions as its own filter, producing a relatively clean sine...
Wide-frequency-ttl-clock
This free-running TTL square-wave oscillator features a variable frequency output spanning a 20:1 range or better. It utilizes four of the six inverters in an SN7404 chip along with additional components. The frequency of oscillation is dictated by the capacitor...
Automatic ttl morse-code keyer
Automatically generated dits and dahs are produced over a speed range of 11 to 39 wpm. The upper limit can be raised by decreasing R2. SW1 and SW2 can be a "homebrew" paddle operated key.
The described circuit is designed to...
SIMPLE TTL CRYSTAL OSCILLATOR
This simple and inexpensive crystal oscillator consists of one-third of a 7404 hex inverter, four resistors, and a crystal. The inverters are biased into their linear regions by resistors R1 to R4, while the crystal provides the necessary feedback. Oscillation...
TTL Three - State Logic Probe PCB
A TTL logic probe is an essential tool for troubleshooting digital circuits. Various methods can be utilized to design a logic probe. The most common designs incorporate operational amplifiers, logic gates (OR, NOT, XOR), and transistors. The circuit described here...
TTL NAND and AND gates
This schematic represents a real circuit, though it is not referred to as a "two-input inverter." An analysis will reveal the circuit's logic function and its appropriate designation. Similar to the inverter and buffer, the "steering" diode cluster labeled "Q1"...