Wednesday, May 2, 2012

Load Electronic Small 555


You can read about the purpose of this board and how it works at ECN Magazine - Low power, low-cost testing.

To order the files for this design ($6.00 US) Click the button below.

Files include
1. Schematic - png double normal size
2. Schematic - design file Tiny CAD format
3. Bill of Materials - Open Office format
4. Gerbers - board size 1" by 3"

A Free Gerber Viewer
The Free Board Design Software I Use - FreePCB

This is a license to use the files to make up to 12 boards. If you want to make more contact me. Please note that you agree to make 12 or fewer in your message when you order. You may not resell the boards. If you want to do that contact me.

And the usual disclaimer: we do not warrant these files as fit for any purpose what so ever.

You might like the board service mentioned here for small quantity production. There is no NRE.

Not available in Illinois (we don't collect sales tax)




Wednesday, December 28, 2011

SEPIC Converrter

Here are a couple of videos on the SEPIC Converter. A design derived from the Cuk Converter. Below the videos are links to some design resources.





National SEPIC design notes. Of course National is now TI. This is probably the simplest design note on the subject I have seen. It is a good place to start for a tennis court estimate of design requirements.

Switching Power Magazine - Analyzing The SEPIC

Maxim AN1051

Linear Technology Spice Circuit Simulation may prove helpful.

Monday, February 15, 2010

Resource Sites

Here is the first one: Joel Owens.

Z-80 Programming Manual Zacks

Z80 Resources

Software Development Tools

Z-80 MCB

Z-80 Emulators

A page of Z80 Emulators.

I particularly like Z80-CPU-Emulator (V 5.2b) Full version, Z80 and/or CP/M 2.2 Emulator, By : Joan Riff

I have used the earlier version (3.10) it and it works well. The last time I used it on a PC I got a simulated speed of 25 MHz (IIRC). I tried it with my 2 GHz PC and I got an off the scale reading.

Here is a book I have used. I wonder if I still have my old copy?

Z-80 and 8080 assembly language programming (Hayden computer programming series)

I like the author of this book. I haven't read the book.

Math Toolkit for Real-Time Programming

EPROM Programmer Parts List

U1 - 74LS374
U2 - 74LS245
U3 - 74LS374
U4 - Device Selector
U5 - 4049
U6 - 7407
U7 - LM723

R1 -
R2 - 47K
R3 - 10K
R4 - 10K
R5 - 5K Trimpot
R6 - 4.7K
R7 - 10.0 K 1%
R8 - 2.80 K 1%
R9 - 100
R10 - 10K
R11 - 10K
R12 - 10K
R13 - 10K
R14 - 4.7K
R15 - 10K
R16 - 10K
R17 - 10K
R18 - 10K
R19 - 4.7K
R20 - 5K Trimpot
R21 - 2.0 K
R22 - 2.0 K

D1 - 1N4002
D2 - 1N4002
D3 - 1N4148

C1 - 100 uF 50V
C2 - 100 uF 50V
C3 - 4.7 uF 50V
C4 - 470 pF
C5 - 220 uF 10V
All other Cs .01 uF

Q1 - 2N2222 - plastic
Q2 - 2N3906 - plastic
Q3 - 2N3906 - plastic

Z1 - 1N4746A 18 V 1W Zener
Z2 - 1N4746A 18 V 1W Zener

Sunday, February 14, 2010

Parts List MCB

This is preliminary. Corrections welcome.

U1 - Z80
U2 - Z8440 SIO
U3 - 74LS244
U4 - 74LS244
U5 - 74LS245
U6 - 74LS367
U7 - 7404
U8 - 74LS14
U9 - 7474
U10 - 74LS32
U11 - 1488 - RS-232
U12 - 1489 - RS232
U13 - R pac 15 4.7K
U14 - 8255 Parallel
U15 - 8255 Parallel
U16 - 8255 Parallel
U17 - 9511 Arithmetic
U18 - 8253 Counter
U19 - 9513 Counter
U20 - 8279 Keyboard
U21 - EPROM
U22 - EPROM/RAM
U23 - EPROM/RAM
U24 - 2114 RAM
U25 - 2114 RAM
U26 - 2114 RAM
U27 - 2114 RAM
U28 - 74LS04
U29 - 74LS30
U30 - 74LS20
U31 - 74LS42
U32 - 74LS00
U33 - 74LS42

R1 - 4.7K
R2 - 47
R3 - 22K
R4 - 330
R5 - 1K
R6 - 1K
R7 - 1K
R8 - 4.7K
R9 - 4.7K
R10 - 1K

D1 - 1N4148

C2 - 220uF
C3 - .01 uF
C4 - .01 uF
C5 - .001 uF
C6 - .001 uF
C7 - .001 uF
C8 - .001 uF
C9 - 470 pF
C10 - 470 pF
C11 - 470 pF
C12 - 470 pF
C27 - 47 pF
C28 - .022 uF
C33 - 47 pF
C34 - 220uF

SW - Reset Switch

All Other Capacitors .01 uF Bypass

Thursday, January 29, 2009

Z80 Books

Here is a list of Z-80 books in no particular order

Assembly Language
Programming in Z80 Assembly Language

Z80 Assembly-Language: Programming for Radio Shack, Timex Sinclair, Adam, and Cp/M Computers ([A Computer literacy skills book])

Introducng Z-80 Assembly Language Programming

Z80 Assembly Language Programming Manual

8080/Z80 Assembly Language: Techniques for Improved Programming

Z-80 Assembly Language Programming

I like this one:
Z-80 and 8080 assembly language programming

The Z80 Microprocessor: Architecture, Interfacing, Programming and Design

Programming the Z80

Dr. Dobb's Z80 Toolbook

Math Toolkit for Real-Time Programming

8080/Z80 Assembly Language: Techniques for Improved Programming


Hardware and Interfacing

101 Projects for the Z80

The 8080, 8085, and Z80: Hardware, Software, Programming, Interfacing, and Troubleshooting

8080/Z80 Assembly Language: Techniques for Improved Programming

Z-80 Microprocessor: Architecture, Interfacing, Programming, and Design (3rd Edition)

Z80 Applications

Z80 Users Manual

Microprocessors and Microcomputer Based System Design: Second Edition

Build Your Own Z80 Computer

Microcomputers and microprocessors/ the 8080, 8085, and Z-80 Programming, Interfacing and Troubleshooting

Stuff For Sale

I have some Z-80 Master Controller Boards for sale. I'm working to set things up. When they are set up properly I'll be announcing prices etc.