I hope you are having a nice summer holiday, anyway in my spare time I've made a few modules for my Eurorack. The inspiration for these came from a Quad Slew design from navs modular lab blog. In that article I came across a link to a DIY page by Doepfer which I hadn't seen before. There's plenty of simple projects there and so I set to work and ended up building a Quad Slew, a Dual Inverter, a CV Amplifier, an Audio Mixer and an expansion port for my A-137-2 Wave Multiplier II. And here's the result.
There's some discussion about the Quad Slew over on the Muff Wigglers Forum
Here's some pictures I took during the build.
![](https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEhvvSCtdIAxYKgum7DXxx6YZ5objv4XagRbIvDtNblKopOHRXtDmWG9iZ4PMIANLogjn-8V2nz6d7uCRdXVqZ8NHmX1kqrYLKYg9i89cyxdv7sLTuoXGPOQXOtCN2qLUaRwCeWgzKsA6Zs/s320/01.jpg)
The blind panels after drilling
![](https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEhrwhlTA31quuw1qPQ3bkSr9SWOP5kyGeIU1DYQGap8gBGCrhqyquKC0hJbwr7H7lxDW4nI6gMszyq7laqbmG50C20L4FfvrPEPrGPD22h1Niy1nCEoxLGI-1CZCsf7_tBv4HJ7iABurAM/s320/02.jpg)
All the hardware mounted (but not yet wired)
![](https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEhsfjB1tKKY2FpwL7tDzcKlWucXUDecaNtlJo2BOVPU2BeAz_NybXLth3DYjWe6OotHb9pDh1X_-RuBSZOMO9QjiD6b5UjdxzhlXvdeuKDWecobU2CDin_pP0IkcHkBK05_nWo2O8jwdPA/s320/03.jpg)
Wiring up the Mixer.
![](https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEixKlL8qALB_SfEj9osUODAl3k8yWmKef9JyPMwYt1Eyy4wkMqO6jEjBP4SMky9P06EFe6mfDflhqQ9Mlabu7o0GoOOKOfecUZVWnKSJUzszWwVe8RmgUo-5LNcCmqNrbPOoeNxLZxQlQo/s320/04.jpg)
Side view of the Mixer, as you can see I glued the opamp to the back of a pot.
![](https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEi1h87AJ-6gfiit-6Nx2XXcQK_l9f02P3I3ILxtTxfuuKQhUtNOzJ0WmN-KYqGbw0LUeqMSrkmHxqM3qDTDU3N8WCHQsshsFaIC0BoVIrCQhVk9vxpTp6XNJLv0WZxvAJ4czQv1sfg0o4Y/s320/05.jpg)
Wiring up the Quad Slew.
![](https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEg-ZEPu8GuhkJhelGr0AlstHc8REUph2K0xlhy5b8bpPabCTKumkpDliAFHWLO_Ox4QFNFt8O3JSivFU6Kk7IjU0LIHCmFOlTkcl02kjEPvgURe5ZVCU6CSPAoeF_izWgXEQxmCDRngQIo/s320/06.jpg)
Wiring up the Dual Inverter / CV Amplifier.
![](https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEheYsM4L82VOtYWJthW9yU0OjjpFa_RqvNpb57wbWCXT6A__-qMZZKMrpkuhmGIdfKrQFnL21g8XqGjz5zFjPfNlS5hF0-X-il9JMFZHjz_HBKPgdWllvYWq_dLIsdnrIfOgYDCUB0BHSI/s320/07.jpg)
Side view of the Dual Inverter / CV Amplifier, again the opamp is glued to a pot.
![](https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEiVVc7aOZpW3L27Tff3bbCmmHNSsOGllJoCuZzOsfJpIKBB6kHeMVkotK5RymzqanPzniSeVlUKr0RrNHtDkXpPOQ3c5HioCJliLN-64-ks1DsE04UYg2anUBcls7I16tUSb4Nwg-hFCN8/s320/08.jpg)
Here's what my modular looks like now with the new modules labeled and installed.
Brilliant stuff as always Paul!
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