Author Topic: Wilf's Bird Sound Circuit  (Read 1306 times)

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Offline queennikki1972Topic starter

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Wilf's Bird Sound Circuit
« on: May 03, 2019, 10:39:36 pm »
This simple circuit calls for a 74HC14 (x6) chip. Google shows it to be a 14 pin chip but the diagram only shows 2 connections and they are not numbered. The symbol looks like a inverter with only 2 connecting points.

Looks simple enough, but can someone explain? Maybe VCC pin to Grnd pin

http://solarbotics.net/library/circuits/misc_sound_wilfbird.html
« Last Edit: May 03, 2019, 10:43:28 pm by queennikki1972 »
Siglent SDS 1202X-E - Heathkit IO-4105 - Dr. Meter 0-30v 5a power supply - 862d+ combo unit - Weller WLC100 - Kunkin KL283 DC load. Not much gear yet.
 

Offline helius

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Re: Wilf's Bird Sound Circuit
« Reply #1 on: May 03, 2019, 10:48:10 pm »
The 74HC14 is a hex inverter, meaning it contains six individual inverter circuits. Each inverter has an input (1A, 2A, 3A, 4A, 5A, 6A) and an output (1Y, 2Y, 3Y, 4Y, 5Y, 6Y), and the Vcc and ground on the chip are shared.

The circuit schematic also uses six inverters, so it uses all six of the parts in the 'HC14. Since it doesn't matter which is which, they are not labeled except as "U1". If it did matter, then the symbols could be labeled "U1A" through "U1F".

 
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Offline wilfred

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Re: Wilf's Bird Sound Circuit
« Reply #2 on: May 04, 2019, 01:34:48 am »
Who is this Wilf of whom you speak?

There was a similar circuit  published in Electronics Australia magazine May 1981 that might interest you.
https://archive.org/stream/EA1981/EA%201981-05%20May#page/n69/mode/2up


I noticed also they were talking about electric cars back then too on page 12.
 

Offline queennikki1972Topic starter

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Re: Wilf's Bird Sound Circuit
« Reply #3 on: May 04, 2019, 11:50:10 am »
Yeah I know, old circuits, but its how I learn. I printed page 71 of this article for the circuit because its a little different
Siglent SDS 1202X-E - Heathkit IO-4105 - Dr. Meter 0-30v 5a power supply - 862d+ combo unit - Weller WLC100 - Kunkin KL283 DC load. Not much gear yet.
 

Online Zero999

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Re: Wilf's Bird Sound Circuit
« Reply #4 on: May 04, 2019, 05:11:02 pm »
Yes, it's a good idea to start with old, proven designs.

Regarding the schematic linked to in the first post: not only are the power supply pins not shown, but there's no decoupling capacitor. Connect a 100nF capacitor between pins 7 and 14, as close to the IC as possible. You may be able to get away without it, especially with the 74C14, rather than the 74HC14 IC, but it's good practise.
 


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