Htaccess : How To Redirect https to http ignoring one folder

Hi my friends,

I just tried to add the following htaccess rules to redirect all https urls (www and non www) (except /wp-admin folder and everything inside it) to http (non www). But when its added, it started to give me redirection loops! Know why its happening?

PS : Im also using w3Total Cache plugin and it have a lot of rewrite rules

RewriteEngine On
RewriteBase /
RewriteCond %{HTTPS} on
RewriteCond %{HTTP_HOST} ^www\.(.*)$ [NC]
RewriteRule ^(.*)$ http://%1/$1 [R=301,L]

RewriteCond %{HTTPS} on
RewriteCond $1 !^wp-admin/
RewriteRule ^(.*)$ http://techhamlet.com/$1 [R=301,L]

Thanks