Wednesday, January 23, 2013

Example circuit boards

As Jim Williams said, "The bit pushers have commented software; why not commented hardware?"

This post contains, in visual form, commentary on some examples of prototype construction technique and some commercial printed-circuit boards (with apologies to Jim Williams... see Appendix F, "Additional Comments on Breadboarding", in [1]).

Solderless breadboard. No.

Wirewrap. Really, no.

Prototyping breadboard with 45 rows of connections for dual-inline-package parts. For soldering together small circuits, these boards aren't bad. (Electronics Goldmine has these boards for $2.)

A better construction technique is deadbug on copper clad. This board is a simple oscillator that Jim Williams built in the deadbug style (a demonstration of [2]; also see [3]).

A pile of deadbug circuit boards built by Jim Williams (his lab bench really looked like this).

The good life. A custom evaluation board (this one is for the Analog Devices AD6816 networking chip with many SMA connectors).

The low-cost circuit board from a floppy disk drive (a single-sided PCB, that includes a "square-wave" trace around the motor for the position encoder).

Left: The one-transistor keypad from an original AT&T touch-tone phone (see [4]). Right: the circuit board for a more recent phone.

A ruggedized power supply (you can tell it's "rugged" from all the epoxy holding the parts in place).

The controller board from an inkjet printer, which includes a wide variety of IC packages such as the socketed DIP, several SOICs, and that EPSON ASIC in the middle with a million pins on tiny spacing.

The PCB inside a Spectral Synthesis ADDA2218, an 18-bit analog-to-digital audio converter, which uses colored FR4 (the color isn't just painted on, it's also impregnated in the fiberglass). I thought this was a neat touch, for a circuit board that only one-in-a-thousand customers would ever see (only those willing to void their warranty!).


[1] Jim Williams, "High speed amplifier techniques: A designer's companion for wideband circuitry," Linear Technology Corp., Milpitas, Calif., Application Note 47, Aug. 1991.
[2] Bernard M. Oliver, "The effect of mu-circuit non-linearity on the amplitude stability of RC oscillators," Hewlett-Packard Journal, vol. 11, no. 8, pp. 1-8, Apr. 1960.
[3] Jim Williams, "Max Wien, Mr. Hewlett, and a rainy Sunday afternoon," in Analog Circuit Design: Art, Science, and Personalities, Jim Williams, Ed. Boston: Butterworth-Heinemann, 1991, ch. 7, pp. 43-55.
[4] L. Schenker, "Pushbutton calling with a two-group voice-frequency code," Bell System Technical Journal, vol. 29, no. 1, pp. 235-255, Jan. 1960.


  1. Printed Circuit Boards are also called a PCB. electronics reverse engineering At every step, the prototype PCB will be tested, and more often than not, the method is repeated many times, before the final product is approved.

  2. This comment has been removed by the author.

  3. We think you deserve better design tools, made specifically for you, to turn great ideas into reality. That’s why we’ve created Circuit board builder. Besides being a collaborative community for electronic design content, Circuit board builder is Schematic & PCB design software, built upon Altium Designer technology. With a streamlined interface and powerful engine to boot, you’ll never have to worry about your software holding you back. This is a free design tool unlike anything you’ve seen before. online pcb manufacturer

  4. This is the first & best article to make me satisfied by presenting good content. I feel so happy and delighted. Thank you so much for this article. PCB Headers Inter Connectors

  5. Jimmy Tong has been a Physical Educator for 13 Years in Singapore, with degree in sports science and physical education from Loughborough University in UK. electric dart boards for adults

  6. This can mean anything from producing the PCBs to making sure that quality control is maintained through PCB testing. visit site The only shortcoming is that it is not fit for the workflow that goes into the development of large designs.

  7. Het was fantastisch. Ik denk dat je je verkeer kunt vergroten op basis van je inhoud.

    Als u uw websiteverkeer, SEO en website laten maken, of app laten maken wilt vergroten, of grafische ontwerp diensten nodig heeft, kunt u contact opnemen met het Nexoz team.

    Nexoz services:

    Website maken

  8. فکر میکنم زیباترین مطبی بود که خوندم.

    هدف ما در تیم دو سوت تعمیر همیشه حفظ رضایتمندی مشتری و تعمیر تمامی لوازم خانگی در حضور مشتریان، بدون جابجایی لوازم خانگی بوده و با عنایت حق، با افتخار دارا بودن ۱۰۰% رضایتمندی مشتریان تا به اینجا به این مهم دست یافتیم.

    کافیست فقط یک بار با کارشناسان 2sottamir تماس بگیرید تا از تفاوت در نوع خدمت رسانی و سرویس دهی آنی سرویس مطلع و برای همیشه یکی از مشتریان راضی ما شوید.

    اگر لوازم خانگی شما نیاز به تعمیرات دارد، همین حالا فرم مشاوره رایگان تعمیرات لوازم خانگی را پر کنید، کارشناسان ما در کوتاهترین زمان ممکن با شما تماس خواهند گرفت.

  9. بسیار پست با کیفیتی بود.

    در صورت نیاز به خدمات طراحی گرافیک، تبلیغات و یا طراحی و توسعه می توانید به شرکت ریوال ایجسنی اعتماد کنید.

    تیم ریوال با سابقه ای درخشان و با در اختیار داشتن کادری مجرب و حرفه ای در عرصه گرافیک و تبلیغات آماده همکاری با شرکت های داخلی و خارجی می باشد.

  10. You have done a great job on this article. It’s very readable and highly intelligent. You have even managed to make it understandable and easy to read. You have some real writing talent. Thank you
    Inflatable paddle board under 400

  11. بهترین مرکز طراحی لوگو در تهران و آرم در تیم خلاق ریوال آنلاین است. این تیم خدمات کاملا حرفه ای و متمایز ارائه می دهد.

  12. Quick turn projects could either be turn-key or consigned, and you can choose the best option in keeping with the requirements of your project. Typically, leading manufacturers will offer you a variety of packages depending on the production quantity, size of the PCB, type of tooling and circuitry required, and the urgency of your project. PCBA board

  13. This is a wonderful article, Given so much info in it, These type of articles keeps the users interest in the website, and keep on sharing more ... good luck Printed Circuit Board

  14. The Texas electric retail supplier will contact the customer on whether to go on with a similar arrangement for the following time frame.
    высоковольтный керамический конденсатор