Sunday 25 November 2018

Castle 111 Flip Flops - LZX video Synth

Some pics from my build of the Castle Flip Flops module.
It's a Eurorack format video module.


The module has three D type Flip Flops that share a common Clock and Reset.

So what's a flip flop? It's a bistable multivitrator. The outputs of Flip Flops have two stable states and can be used to store data. The Flip-Flop is also known as a latch. It's a fundamental building block in computers, counters, registers, memories, decoders & sequential logic.

Flip Flops are basically memory circuits. They can remember the logic state in which they were set. When a flip flop is set in one of its two possible states, it will remain in that condition until it is changed (or power is removed).

A D-type is also known as a Delay Flip flop, Data Latch or D-type Transparent Latch. They are used in Sequential Circuits.

The flip flop ic being used in this module is a SN74HC174N. 
It's a a hex positive-edge-triggered D-type Flip-flop  
It's a TTL series 74xx.

So Flip flops are like binary sample and holds. There are 3 so you can do a sample and hold type operation on the adc output for example. It has the effect of pixelizing. (Philip)

Anything can be used as an input, it doesn't need to be binary logic signals  



The SN74HC174 contains 6 flipflops, but it appears only 3 are used in the module.
The basic D Flip Flop has a D (data) input and a clock input and outputs Q.
It also includes a CLR (Clear) control input.
Information  at  the  data  (D)  inputs  is  transferred  to  the outputs  (Q) on  the  positive-going  edge  of  a clock (CLK)   pulse. This flip-flop is a positive edge-triggered flip flop. This means that the flip flop changes output value only when the clock is at a positive edge (or rising clock edge).






iT'S done !

LZX - Castle
Introduction
00_000 ADC - Analog to digital converter
01_001 DAC - Digital to Analog converter
02_010 Clock VCO
03_011 Shift Register
04_100 Multi Gate
05_101 Quad Gate
06_110 Counter
07_111 Flip flops

Links
+ LZX industries
+ CMOS
+ TTL (transistor-transistor logic)

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