Friday, September 9, 2011

Filters with cd4069

Here are two easy to build filter circuits based on the cd4069 chip. I´ve used them in my recent projects and I´m quite pleased how they work. These schematics are examples meant to be a starting point and the component values are examples so feel free to experiment with different values.

First a lowpass filter

It uses three inverters. So you can build two with a single 4069. R1 and R2 are the cutoff frequency use a 10k-20k stereo pot or two ldrs and leds driven with a cv source (lfo,sequencer etc.). Cap values are drawn 0,1uF but I´ve built one with 0,047uF and it worked fine. The 100k pot is resonance, and this filter will oscillate when resonance is turned up. There are two output options drawn in the schematic "out" (wich is more bassy) and "out2". You might want to use a output cap (1uF).

Second one is a bandpass filter.

This thing uses only one inverter. Try different cap values instead of 0,01uF ones(maybe from 0,001 to 0,068) and they dont all need to be the same. This is also voltage controlled with the npn-transistor you can use a pot to ground, ldr etc. insead if you like.


carl said...

Manager Andrew Monarch said, "The MBT Ari could be the gold standard in rocker-sole shoes. Customers who have plantar fasciitis, in particular, will benefit from the rocker motion that helps to keep the plantar fascia stretched. It's also great for anyone interested in rocker-sole shoes, since the increased size of the sole really helps you tone muscles with the controlled motion you experience with each step. We expect our customers to be really pleased with the superior technological features of this shoe."

rsgoldb2c1007 said...

This can be my own first time my partner and i go here. I ran across a lot of engaging stuff within your blog site, specially the discussion. Through the plenty of remarks on your own content articles, I reckon that I'm not on your own obtaining every one of the amusement the following! Continue the great function.

Buy Maplestory Mesos said...


rsgoldifzf said...

Thanks for providing such useful information. I must say i many thanks for professional approach. I have to appreciate the efforts you have made on paper this post. I hope exactly the same best product within you in the foreseeable future in addition.Runescape Gold Buy Runescape Gold Cheap Runescape Gold

Anonymous said...

Apparently, instances of Cyclops phenomena are not too rare. cambridge satchel | cambridge satchel | cambridge satchel

cheap cartier jewelry said...

hermes handbags wholesale silly bandz are a brand of silicone rubber bands formed into shapes including animals cambridge satchel us. for high quality wholesale efx bracelet products on DHgate and get worldwide hermes birkin for sale delivery.

4rsgold said...

We expect our customers to be really pleased with the superior technological features of this shoe.

Cheap Soccer Shirts
Cheap Football Shirts
henry 12 arsenal jersey
messi jersey 10 argentina
fabregas jersey arsenal
david villa barcelona youth jersey
benzema soccer jerseys
cristiano ronaldo real madrid jersey
cheap rooney soccer jerseys
kaka soccer jersey
real madrid shirt
new fc barcelona jersey
argentina jersey 2012
Brazil jerseys wholesale
cameroon jerseys wholesale
england jerseys sale

maple story mesos said...

Once again great post. You seem to have a good understanding of these themes.When I entering your blog,I felt this . Come on and keep writting your blog will be more attractive. To Your Success!

Classic Dresses
Classic Bridesmaid Dresses
Wedding Dresses with Sleeves
Flower Girl Dresses
Empire Wedding Dresses

Jack said...

As soon as an individual buys a Coach purse, they usually will not turn to other brands! Though, buyers need to be conscious. Due to the brands popularity, a lot more and far more replicas are becoming designed. In other words, counterfeit items.

Jack said...
This comment has been removed by the author.
sanatesi520 said...

If you have enough black bags, maybe you want something different. You can find that here also. They have bags in every style and color to fit every taste and lifestyle. The hardest thing you will have to do is to choose only one, so do not just stop at one. Snakeskin embossing is used on a variety of these backpacks and bags.oakley sunglasses
cheap oakley sunglasses
oakley prescription sunglasses
oakley glasses
oakley outlet

lovemmohome said...

One of my friends is a Runescape Gold Fan.He spent most of time to play the game.He is also a Usfine fan.He would Buy Runescape Gold when he is poor.He told me" usfine is a close friend for me in Cheap Runescape Gold" Is he funny?no,he just said the words from the heart.He knew lots friend in RS Gold,He appreciate that Rs make his life to be more wonderful.He would think" What does Cheapest WOW Gold
have to offer to its millions of players?"

Gofavor said...

you will need this

jessiedresstyle said...

Selecting clothes: All of us begin along with selecting an ideal graduating gown. Right now that will end up being 'kinda' difficult, girls and boys! The reason being you would like clothes in order to depict that you're changing in to a grownup, however, you continue to be being Alfred Angelo. As a result, you don't would like not need in order to overdo the actual i-am-an-adult sensation according to the gown. Specifically for ladies, it's a restricted string stroll simply because their own moms would really like these phones display which she's the 'little woman'.

Venessa's blog said...
This comment has been removed by the author.
Venessa's blog said...

sell rs accounts to earn money

Unknown said...

I am so fascinated with the entire content of your site, from the material to the theme. I really had a great time reading and watching this post. Nissan car leasing

Unknown said...

I am glad for commenting to let you understand what a awesome discovery our girl gained checking yuor web blog. She discovered such a lot of issues, including what it's like to possess an awesome helping mindset to have a number of people effortlessly gain knowledge of selected problematic topics. Phien dich

Unknown said...

different cap values instead of 0,01uF ones(maybe from 0,001 to 0,068) and they dont all need to be the same. This is also voltage controlled with theWOW Gold
Gold Kaufen für World of Warcraft

Anonymous said...

Movado womens and you will be able timepieces have any wonderful plus imaginative features so are avalable on ergonomic workdesk designs utilising inventive demonstrates of energy. The ordering price belonging to the Movado timepieces is a little within the increased part and not not cost effective. Nevertheless which inturn shouldn't discontinue you as a result of acquiring you because each individual Movado watch is a classic masterwork precious time goalkeeper. Among the many unique different Movado womens and you replica Swiss Valjoux 7750 watches will be able timepieces is definitely Replica Breitling watches the classic a genuine dept replica Breitling watches in transportation considering the 12 o-clock make though it could actually make examining cheap replica watches UK occasion harder nevertheless it offers an important definitive the school and pattern. Additionally, best imitation Panerai watches you can get sports fun-based activities edition across Movado creations, although you will not likely discover a whole lot of varieties.

Unknown said...

Thanks for sharing your info. I really appreciate your efforts and I will be waiting for your further write

download descargar facebook para android gratis para Android celular and download free facebook descargar and descargar facebook gratis , descarga facebook

Unknown said...

I would like to thank you for your nicely written post
download free descargar Whatsapp android and download baixar whatsapp plus gratis online and descargar whatsapp , baixar whatsapp gratis

Cadencealida said... will give you the best shopping experience in the industry. We have a professional team that provides excellent online customer service and we guarantee delivery within five minutes (except for special cases). We will maximize the security of your account.

1. Excellent service standards
2. Fast delivery
3. Competitive prices
4. Secure transactions
5. The best choice

Buy POE Currency, we are the best choice

Cadencealida said...

Very classic Runescape, this is an MMORPG game that has been popular for many times. It belongs to the best game in the entire industry and is worth trying by all enthusiasts. RSGOLDB2C has always been committed to promoting Runescape so that more players can understand this excellent game as the best Runescape Gold supplier. Every player who Buy RS Gold on will be able to enjoy the lowest price, best service and fastest delivery in the whole industry.